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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.02353">arXiv:2110.02353</a> <span> [<a href="https://arxiv.org/pdf/2110.02353">pdf</a>, <a href="https://arxiv.org/format/2110.02353">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Formation and Evolution of Wakes in the Spacetime Generated by a Cosmic String in $f(R)$ Theory of Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Carvalho%2C+G+C">G. C. Carvalho</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a>, <a href="/search/gr-qc?searchtype=author&query=Mesquita%2C+P+O">P. O. Mesquita</a>, <a href="/search/gr-qc?searchtype=author&query=Neto%2C+J+L">J. L. Neto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.02353v1-abstract-short" style="display: inline;"> The formation and evolution of cosmic string wakes in the framework of a $f(R)$ theory of gravity are investigated in this work. We consider a simple model in which baryonic matter flows past a cosmic string. We treat this problem in the Zel'dovich approximation. We compare our results with previous results obtained in the context of General Relativity and Scalar-Theories of Gravity. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.02353v1-abstract-full" style="display: none;"> The formation and evolution of cosmic string wakes in the framework of a $f(R)$ theory of gravity are investigated in this work. We consider a simple model in which baryonic matter flows past a cosmic string. We treat this problem in the Zel'dovich approximation. We compare our results with previous results obtained in the context of General Relativity and Scalar-Theories of Gravity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.02353v1-abstract-full').style.display = 'none'; document.getElementById('2110.02353v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of High Energy Physics, Gravitation and Cosmology 2021 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.02901">arXiv:1905.02901</a> <span> [<a href="https://arxiv.org/pdf/1905.02901">pdf</a>, <a href="https://arxiv.org/format/1905.02901">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.4236/jhepgc.2019.53032">10.4236/jhepgc.2019.53032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the Thermodynamical Black Hole Stability in the Space-time of a Global Monopole in $f(R)$-Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Lustosa%2C+F+B">Francisco Bento Lustosa</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">Maria Emilia Xavier Guimar茫es</a>, <a href="/search/gr-qc?searchtype=author&query=Ferreira%2C+C+N">Cristine Nunes Ferreira</a>, <a href="/search/gr-qc?searchtype=author&query=Neto%2C+J+L">Joaquim Lopes Neto</a>, <a href="/search/gr-qc?searchtype=author&query=Helayel-Neto%2C+J+A">Jos茅 Abdalla Helayel-Neto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.02901v2-abstract-short" style="display: inline;"> In this work, we re-assess a class of black hole solutions in a global monopole spacetime in the framework of an $f(R)$-gravity model. Our main line of investigation consists in considering a region close enough to the black hole, but such that the weak field approximation is still valid. The stability of the black hole is studied in terms of its thermodynamical properties, with the radial coordin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02901v2-abstract-full').style.display = 'inline'; document.getElementById('1905.02901v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.02901v2-abstract-full" style="display: none;"> In this work, we re-assess a class of black hole solutions in a global monopole spacetime in the framework of an $f(R)$-gravity model. Our main line of investigation consists in considering a region close enough to the black hole, but such that the weak field approximation is still valid. The stability of the black hole is studied in terms of its thermodynamical properties, with the radial coordinate written as a power law function with the status of the main factor underneath the stability of the model. We obtain the explicit expressions for the thermodynamical quantities of the black hole as functions of the event horizon, by considering both the Hawking and the local temperatures. The phase transitions that may occur in this system, including the Hawking-Page phase transition, are inspected with particular attention. We work out and contemplate a solution of special interest in which one of the parameters is related to the cosmological constant. Our main result sets out to establish a comparison between both the Hawking and the local formalisms for the black hole in the framework of the $f(R)$-gravity in the particular space-time adopted here. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02901v2-abstract-full').style.display = 'none'; document.getElementById('1905.02901v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: text overlap with arXiv:1510.08176</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEPGC 5 (2019) 587-611 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.03054">arXiv:1712.03054</a> <span> [<a href="https://arxiv.org/pdf/1712.03054">pdf</a>, <a href="https://arxiv.org/format/1712.03054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-017-5397-1">10.1140/epjc/s10052-017-5397-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A nearly cylindrically symmetric source in the Brans-Dicke gravity as the generator of the rotational curves of the galaxies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Santos%2C+S+M+d">S. Mittmann dos Santos</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a>, <a href="/search/gr-qc?searchtype=author&query=Neto%2C+J+L">J. L. Neto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.03054v1-abstract-short" style="display: inline;"> Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant value. Up to know, the reason for this behavior is still a matter for debate. In this work, we propose a model which adequately describes this unusual behavior using a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03054v1-abstract-full').style.display = 'inline'; document.getElementById('1712.03054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.03054v1-abstract-full" style="display: none;"> Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant value. Up to know, the reason for this behavior is still a matter for debate. In this work, we propose a model which adequately describes this unusual behavior using a (nearly) cylindrical symmetrical solution in the framework of a scalar-tensor-like (the Brans-Dicke model) theory of gravity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03054v1-abstract-full').style.display = 'none'; document.getElementById('1712.03054v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 4 figures, accepted for publication in Eur. Phys. J. C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 77, 848 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1403.7139">arXiv:1403.7139</a> <span> [<a href="https://arxiv.org/pdf/1403.7139">pdf</a>, <a href="https://arxiv.org/ps/1403.7139">ps</a>, <a href="https://arxiv.org/format/1403.7139">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="K-Theory and Homology">math.KT</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-014-2880-9">10.1140/epjc/s10052-014-2880-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Topological Vertex, String Amplitudes and Spectral Functions of Hyperbolic Geometry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=Luna%2C+R+M">R. M. Luna</a>, <a href="/search/gr-qc?searchtype=author&query=Rosa%2C+T+O">T. O. Rosa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1403.7139v2-abstract-short" style="display: inline;"> We discuss the homological aspects of the connection between quantum string generating function and the formal power series associated to the dimensions of chains and homologies of suitable Lie algebras. Our analysis can be considered as a new straightforward application of the machinery of modular forms and spectral functions (with values in the congruence subgroup of $SL(2,{\mathbb Z})$) to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.7139v2-abstract-full').style.display = 'inline'; document.getElementById('1403.7139v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.7139v2-abstract-full" style="display: none;"> We discuss the homological aspects of the connection between quantum string generating function and the formal power series associated to the dimensions of chains and homologies of suitable Lie algebras. Our analysis can be considered as a new straightforward application of the machinery of modular forms and spectral functions (with values in the congruence subgroup of $SL(2,{\mathbb Z})$) to the partition functions of Lagrangian branes, refined vertex and open string partition functions, represented by means of formal power series that encode Lie algebra properties. The common feature in our examples lies in the modular properties of the characters of certain representations of the pertinent affine Lie algebras and in the role of Selberg-type spectral functions of an hyperbolic three-geometry associated with $q$-series in the computation of the string amplitudes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.7139v2-abstract-full').style.display = 'none'; document.getElementById('1403.7139v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised version. References added, results remain unchanged. arXiv admin note: text overlap with arXiv:hep-th/0701156, arXiv:1105.4571, arXiv:1206.0664 by other authors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.4980">arXiv:1205.4980</a> <span> [<a href="https://arxiv.org/pdf/1205.4980">pdf</a>, <a href="https://arxiv.org/ps/1205.4980">ps</a>, <a href="https://arxiv.org/format/1205.4980">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.87.106011">10.1103/PhysRevD.87.106011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effective gravitational equations for f(R) braneworld models </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Carames%2C+T+R+P">T. R. P. Carames</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1205.4980v2-abstract-short" style="display: inline;"> The viability of achieving gravitational consistent braneworld models in the framework of a f(R) theory of gravity is investigated. After a careful generalization of the usual junction conditions encompassing the embedding of the 3-brane into a f(R) bulk, we provide a prescription giving the necessary constraints in order to implement the projected second order effective field equations on the bra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.4980v2-abstract-full').style.display = 'inline'; document.getElementById('1205.4980v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.4980v2-abstract-full" style="display: none;"> The viability of achieving gravitational consistent braneworld models in the framework of a f(R) theory of gravity is investigated. After a careful generalization of the usual junction conditions encompassing the embedding of the 3-brane into a f(R) bulk, we provide a prescription giving the necessary constraints in order to implement the projected second order effective field equations on the brane. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.4980v2-abstract-full').style.display = 'none'; document.getElementById('1205.4980v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, no figures. Accepted for publication in the Physical Review D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 87, 106011 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.1856">arXiv:1111.1856</a> <span> [<a href="https://arxiv.org/pdf/1111.1856">pdf</a>, <a href="https://arxiv.org/ps/1111.1856">ps</a>, <a href="https://arxiv.org/format/1111.1856">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0217732312501775">10.1142/S0217732312501775 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the motion of a test particle around a global monopole in a modified gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Caram%C3%AAs%2C+T+R+P">T. R. P. Caram锚s</a>, <a href="/search/gr-qc?searchtype=author&query=de+Mello%2C+E+R+B">E. R. Bezerra de Mello</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1111.1856v3-abstract-short" style="display: inline;"> In this paper we suggest an approach to analyse the motion of a test particle in the spacetime of a global monopole within a $f(R)$-like modified gravity. The field equations are written in a more simplified form in terms of $F(R)=\frac{df(R)}{dR}$. Since we are dealing with a spherically symmetric problem, $F(R)$ is expressed as a radial function ${\cal F}(r)\equiv{F(R(r))}$. So, the choice of a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.1856v3-abstract-full').style.display = 'inline'; document.getElementById('1111.1856v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.1856v3-abstract-full" style="display: none;"> In this paper we suggest an approach to analyse the motion of a test particle in the spacetime of a global monopole within a $f(R)$-like modified gravity. The field equations are written in a more simplified form in terms of $F(R)=\frac{df(R)}{dR}$. Since we are dealing with a spherically symmetric problem, $F(R)$ is expressed as a radial function ${\cal F}(r)\equiv{F(R(r))}$. So, the choice of a specific form for $f(R)$ will be equivalent to adopt an Ansatz for ${\cal F}(r)$. By choosing an explicit functional form for ${\cal F}(r)$ we obtain the weak field solutions for the metric tensor, compute the time-like geodesics and analyse the motion of a massive test particle. An interesting feature is an emerging attractive force exerted by the monopole on the particle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.1856v3-abstract-full').style.display = 'none'; document.getElementById('1111.1856v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figure. New version accepted for publication in Modern Physics Letters A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Mod. Phys. Lett. A, Vol. 27, No. 30 (2012) 1250177 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.4033">arXiv:1106.4033</a> <span> [<a href="https://arxiv.org/pdf/1106.4033">pdf</a>, <a href="https://arxiv.org/ps/1106.4033">ps</a>, <a href="https://arxiv.org/format/1106.4033">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S2010194511000961">10.1142/S2010194511000961 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gravitational Field of a Global Monopole in a Modified Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Caram%C3%AAs%2C+T+R+P">T. R. P. Caram锚s</a>, <a href="/search/gr-qc?searchtype=author&query=de+Mello%2C+E+R+B">E. R. Bezerra de Mello</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1106.4033v2-abstract-short" style="display: inline;"> In this paper we analyze the gravitational field of a global monopole in the context of $f(R)$ gravity. More precisely, we show that the field equations obtained are expressed in terms of $F(R)=\frac{df(R)}{dR}$. Since we are dealing with a spherically symmetric system, we assume that $F(R)$ is a function of the radial coordinate only. Moreover, adopting the weak field approximation, we can provid… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4033v2-abstract-full').style.display = 'inline'; document.getElementById('1106.4033v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.4033v2-abstract-full" style="display: none;"> In this paper we analyze the gravitational field of a global monopole in the context of $f(R)$ gravity. More precisely, we show that the field equations obtained are expressed in terms of $F(R)=\frac{df(R)}{dR}$. Since we are dealing with a spherically symmetric system, we assume that $F(R)$ is a function of the radial coordinate only. Moreover, adopting the weak field approximation, we can provide all components of the metric tensor. A comparison with the corresponding results obtained in General Relativity and in the Brans-Dicke theory is also made. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4033v2-abstract-full').style.display = 'none'; document.getElementById('1106.4033v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, work presented in the 8th Alexander Friedmann International Seminar on Gravitation and Cosmology, in Rio de Janeiro, 30/05 to 03/06/2011</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> International Journal of Modern Physics: Conference Series, v. 03, p. 446-454, 2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1001.1075">arXiv:1001.1075</a> <span> [<a href="https://arxiv.org/pdf/1001.1075">pdf</a>, <a href="https://arxiv.org/ps/1001.1075">ps</a>, <a href="https://arxiv.org/format/1001.1075">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP09(2010)051">10.1007/JHEP09(2010)051 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Positive tension 3-branes in an $AdS_{5}$ bulk </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Abdalla%2C+M+C+B">M. C. B. Abdalla</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1001.1075v2-abstract-short" style="display: inline;"> In this work, we review and extend the so-called consistency conditions for the existence of a braneworld scenario in arbitrary dimensions in the Brans-Dicke (BD) gravitational theory. After that, we consider the particular case of a five-dimensional scenario which seems to have phenomenological interesting implications. We show that, in the BD framework, it is possible to achieve necessary condit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.1075v2-abstract-full').style.display = 'inline'; document.getElementById('1001.1075v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1001.1075v2-abstract-full" style="display: none;"> In this work, we review and extend the so-called consistency conditions for the existence of a braneworld scenario in arbitrary dimensions in the Brans-Dicke (BD) gravitational theory. After that, we consider the particular case of a five-dimensional scenario which seems to have phenomenological interesting implications. We show that, in the BD framework, it is possible to achieve necessary conditions pointing to the possibility of accommodating branes with positive tensions in an AdS bulk by the presence of the additional BD scalar field, avoiding in this way the necessity of including unstable objects in the compactification scheme. Furthermore, in the context of time variable brane tension, it is shown that the brane tension may change its sign, following the bulk cosmological constant sign. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.1075v2-abstract-full').style.display = 'none'; document.getElementById('1001.1075v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 August, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 January, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, new version to appear in JHEP</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 1009:051,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.2188">arXiv:0907.2188</a> <span>  </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Cosmic String Solution in a Born-Infeld Type Theory of Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=da+Rocha%2C+W+J">W. J. da Rocha</a>, <a href="/search/gr-qc?searchtype=author&query=de+Oliveira%2C+A+L+N">A. L. Naves de Oliveira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0907.2188v3-abstract-short" style="display: inline;"> In this work we derive an exact solution for the exterior metric of a local cosmic string in an effective theory of gravity, the so-called NDL theory, which is inspired in the Born-Infeld theory. The solution is given by a family of parameters which presents quite different features from that of the General Relativity theory. The differences come from the specific choice of the gravitation Lagra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.2188v3-abstract-full').style.display = 'inline'; document.getElementById('0907.2188v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.2188v3-abstract-full" style="display: none;"> In this work we derive an exact solution for the exterior metric of a local cosmic string in an effective theory of gravity, the so-called NDL theory, which is inspired in the Born-Infeld theory. The solution is given by a family of parameters which presents quite different features from that of the General Relativity theory. The differences come from the specific choice of the gravitation Lagrangian which is based on a spin-1 construction of the gravitation theory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.2188v3-abstract-full').style.display = 'none'; document.getElementById('0907.2188v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, no figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.4609">arXiv:0811.4609</a> <span> [<a href="https://arxiv.org/pdf/0811.4609">pdf</a>, <a href="https://arxiv.org/ps/0811.4609">ps</a>, <a href="https://arxiv.org/format/0811.4609">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> </div> <p class="title is-5 mathjax"> Brane-Wor(l)ds within Brans-Dicke Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Abdalla%2C+M+C+B">M. C. B. Abdalla</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0811.4609v1-abstract-short" style="display: inline;"> We review some recent results obtained from the application of the Gauss-Codazzi formalism to brane-worlds models in the Brans-Dicke gravity. The cases of 4-branes embedded in a six-dimensional with and without $\mathbb{Z}_{2}$ symmetry are both analyzed. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.4609v1-abstract-full" style="display: none;"> We review some recent results obtained from the application of the Gauss-Codazzi formalism to brane-worlds models in the Brans-Dicke gravity. The cases of 4-branes embedded in a six-dimensional with and without $\mathbb{Z}_{2}$ symmetry are both analyzed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.4609v1-abstract-full').style.display = 'none'; document.getElementById('0811.4609v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages. Invited contribution to the Special Issue "The Problems of Modern Cosmology", on the occasion of Prof. S. D. Odintsov's 50th birthday</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0707.0233">arXiv:0707.0233</a> <span> [<a href="https://arxiv.org/pdf/0707.0233">pdf</a>, <a href="https://arxiv.org/ps/0707.0233">ps</a>, <a href="https://arxiv.org/format/0707.0233">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2008/09/021">10.1088/1475-7516/2008/09/021 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards an hybrid compactification with a scalar-tensor global cosmic string </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Abdalla%2C+M+C+B">M. C. B. Abdalla</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0707.0233v2-abstract-short" style="display: inline;"> We derive a solution of the gravitational equations which leads to a braneworld scenario in six dimensions using a global cosmic string solution in a low energy effective string theory framework. The final spacetime is composed by one warped brane with $\mathbb{R}^{(3,1)}\times S^{1}$ topology and a power law warp factor, and one noncompact extra dimension transverse to the brane. By looking at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.0233v2-abstract-full').style.display = 'inline'; document.getElementById('0707.0233v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0707.0233v2-abstract-full" style="display: none;"> We derive a solution of the gravitational equations which leads to a braneworld scenario in six dimensions using a global cosmic string solution in a low energy effective string theory framework. The final spacetime is composed by one warped brane with $\mathbb{R}^{(3,1)}\times S^{1}$ topology and a power law warp factor, and one noncompact extra dimension transverse to the brane. By looking at the current experimental bounds, we find a range of parameters in which, if the on-brane dimension has an acceptable size, it does not solve the hierarchy problem. In another example this problem is smoothed by the Brans-Dicke parameter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.0233v2-abstract-full').style.display = 'none'; document.getElementById('0707.0233v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 September, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 July, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">RevTex, 7 pages. New version to be published in the JCAP (2008)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-th/0703234">arXiv:hep-th/0703234</a> <span> [<a href="https://arxiv.org/pdf/hep-th/0703234">pdf</a>, <a href="https://arxiv.org/ps/hep-th/0703234">ps</a>, <a href="https://arxiv.org/format/hep-th/0703234">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.75.084028">10.1103/PhysRevD.75.084028 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Brane Cosmic String Compactification in Brans-Dicke Theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Abdalla%2C+M+C+B">M. C. B. Abdalla</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=da+Silva%2C+J+M+H">J. M. Hoff da Silva</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-th/0703234v1-abstract-short" style="display: inline;"> We investigate an alternative compactification of extra dimensions using local cosmic string in the Brans-Dicke gravity framework. In the context of dynamical systems it is possible to show that there exist a stable field configuration for the Einstein-Brans-Dicke equations. We explore the analogies between this particular model and the Randall-Sundrum scenario. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-th/0703234v1-abstract-full" style="display: none;"> We investigate an alternative compactification of extra dimensions using local cosmic string in the Brans-Dicke gravity framework. In the context of dynamical systems it is possible to show that there exist a stable field configuration for the Einstein-Brans-Dicke equations. We explore the analogies between this particular model and the Randall-Sundrum scenario. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-th/0703234v1-abstract-full').style.display = 'none'; document.getElementById('hep-th/0703234v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">RevTex, 5 pages, no figures. To appear in the Physical Review D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D75:084028,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0507109">arXiv:gr-qc/0507109</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0507109">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0507109">ps</a>, <a href="https://arxiv.org/format/gr-qc/0507109">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Astrophysics">astro-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0218271806007924">10.1142/S0218271806007924 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Contributions from Dilatonic Strings to the Flat Behaviour of the Rotational Curves in Galaxies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Costa%2C+M+L">M. Leineker Costa</a>, <a href="/search/gr-qc?searchtype=author&query=de+Oliveira%2C+A+L+N">A. L. Naves de Oliveira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0507109v2-abstract-short" style="display: inline;"> We analyse the flat behaviour of the rotational curves in some galaxies in the framework of a dilatonic, current-carrying string. We determine the expression of the tangential velocity of test objects following a stable circular equatorial orbit in this spacetime. </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0507109v2-abstract-full" style="display: none;"> We analyse the flat behaviour of the rotational curves in some galaxies in the framework of a dilatonic, current-carrying string. We determine the expression of the tangential velocity of test objects following a stable circular equatorial orbit in this spacetime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0507109v2-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0507109v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 December, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 July, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This version to be published in the Int. Journal of Modern Phys. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Int.J.Mod.Phys. D15 (2006) 387-394 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0411120">arXiv:gr-qc/0411120</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0411120">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0411120">ps</a>, <a href="https://arxiv.org/format/gr-qc/0411120">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Dilatonic, Chiral Cosmic Strings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Andrade%2C+V+C">V. C. Andrade</a>, <a href="/search/gr-qc?searchtype=author&query=de+Oliveira%2C+A+L+N">A. L. Naves de Oliveira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0411120v2-abstract-short" style="display: inline;"> In this work, we deal with the chiral string model for which the world-sheet current is null in the framework of a scalar-tensor gravity. Our main goal is to analyse the impact of such a current on the gravitational macroscopic effects. For the purpose of this analysis, we first study the gravitational properties of the spacetime generated by this string in the presence of a dilaton field. Then,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0411120v2-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0411120v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0411120v2-abstract-full" style="display: none;"> In this work, we deal with the chiral string model for which the world-sheet current is null in the framework of a scalar-tensor gravity. Our main goal is to analyse the impact of such a current on the gravitational macroscopic effects. For the purpose of this analysis, we first study the gravitational properties of the spacetime generated by this string in the presence of a dilaton field. Then, we carry out an investigation of the mechanism of formation and evolution of wakes in this framework, showing the explicit contribution of the chirality to this effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0411120v2-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0411120v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2004; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 November, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 2 figures, to appear in Journal of High Energy Physics (Proceedings Section)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS WC2004 (2004) 034 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0409098">arXiv:gr-qc/0409098</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0409098">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0409098">ps</a>, <a href="https://arxiv.org/format/gr-qc/0409098">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S021773230401535X">10.1142/S021773230401535X <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Formation of Wakes by Chiral, Conducting Cosmic Strings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Abdalla%2C+M+C+B">M. C. B. Abdalla</a>, <a href="/search/gr-qc?searchtype=author&query=Bytsenko%2C+A+A">A. A. Bytsenko</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0409098v1-abstract-short" style="display: inline;"> Chiral cosmic strings are naturally produced at the end of D-term inflation and they present very interesting cosmological consequences. In this work, we investigate the formation and evolution of wakes by a chiral string. We show that, for cold dark matter, the mechanism of forming wakes by a chiral string is similar to the mechanism by an ordinary string. </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0409098v1-abstract-full" style="display: none;"> Chiral cosmic strings are naturally produced at the end of D-term inflation and they present very interesting cosmological consequences. In this work, we investigate the formation and evolution of wakes by a chiral string. We show that, for cold dark matter, the mechanism of forming wakes by a chiral string is similar to the mechanism by an ordinary string. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0409098v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0409098v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 September, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, no figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Mod.Phys.Lett.A19:2445,2004 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-th/0303112">arXiv:hep-th/0303112</a> <span> [<a href="https://arxiv.org/pdf/hep-th/0303112">pdf</a>, <a href="https://arxiv.org/ps/hep-th/0303112">ps</a>, <a href="https://arxiv.org/format/hep-th/0303112">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.67.123514">10.1103/PhysRevD.67.123514 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Wakes in Dilatonic Current-Carrying Cosmic Strings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Oliveira%2C+A+L+N">A. L. N. Oliveira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-th/0303112v3-abstract-short" style="display: inline;"> In this work, we present the gravitational field generated by a cosmic string carrying a timelike current in the scalar-tensor gravities. The mechanism of formation and evolution of wakes is fully investigated in this framework. We show explicitly that the inclusion of electromagnetic properties for the string induces logarithmic divergences in the accretion problem. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-th/0303112v3-abstract-full" style="display: none;"> In this work, we present the gravitational field generated by a cosmic string carrying a timelike current in the scalar-tensor gravities. The mechanism of formation and evolution of wakes is fully investigated in this framework. We show explicitly that the inclusion of electromagnetic properties for the string induces logarithmic divergences in the accretion problem. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-th/0303112v3-abstract-full').style.display = 'none'; document.getElementById('hep-th/0303112v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 March, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised version to be published in the Phys. Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. D67 (2003) 123514 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0201101">arXiv:gr-qc/0201101</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0201101">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0201101">ps</a>, <a href="https://arxiv.org/format/gr-qc/0201101">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> On the Weak-Field Approximation in Generalized Scalar-Tensor Gravities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=Colatto%2C+L+P">L. P. Colatto</a>, <a href="/search/gr-qc?searchtype=author&query=Tourinho%2C+F+B">F. B. Tourinho</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0201101v1-abstract-short" style="display: inline;"> In the paper published in Phys. Lett. A245} (1998) 31, Barros and Romero demonstrated that, in the weak-field approximation, solutions to the Brans-Dicke equations are related to the solutions of General Relativity for the same matter distributions. In the present work, we enphasize this result and we extend it to for generalized scalar-tensor theories in which the parameter $蠅$ is no longer a c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0201101v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0201101v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0201101v1-abstract-full" style="display: none;"> In the paper published in Phys. Lett. A245} (1998) 31, Barros and Romero demonstrated that, in the weak-field approximation, solutions to the Brans-Dicke equations are related to the solutions of General Relativity for the same matter distributions. In the present work, we enphasize this result and we extend it to for generalized scalar-tensor theories in which the parameter $蠅$ is no longer a constant but an arbitrary function of the (gravitational) scalar field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0201101v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0201101v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 January, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Spacetime and Substance 2 (2001) 71-74 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0104038">arXiv:gr-qc/0104038</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0104038">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0104038">ps</a>, <a href="https://arxiv.org/format/gr-qc/0104038">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.65.104027">10.1103/PhysRevD.65.104027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scalar and Spinor Particles in the Spacetime of a Domain Wall in String Theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Bezerra%2C+V+B">V. B. Bezerra</a>, <a href="/search/gr-qc?searchtype=author&query=Colatto%2C+L+P">L. P. Colatto</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=Filho%2C+e+R+M+T">e R. M. Teixeira Filho</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0104038v2-abstract-short" style="display: inline;"> We consider scalar and spinor particles in the spacetime of a domain wall in the context of low energy effective string theories, such as the generalized scalar-tensor gravity theories. This class of theories allows for an arbitrary coupling of the wall and the (gravitational) scalar field. First, we derive the metric of a wall in the weak-field approximation and we show that it depends on the w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0104038v2-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0104038v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0104038v2-abstract-full" style="display: none;"> We consider scalar and spinor particles in the spacetime of a domain wall in the context of low energy effective string theories, such as the generalized scalar-tensor gravity theories. This class of theories allows for an arbitrary coupling of the wall and the (gravitational) scalar field. First, we derive the metric of a wall in the weak-field approximation and we show that it depends on the wall's surface energy density and on two post-Newtonian parameters. Then, we solve the Klein-Gordon and the Dirac equations in this spacetime. We obtain the spectrum of energy eigenvalues and the current density in the scalar and spinor cases, respectively. We show that these quantities, except in the case of the energy spectrum for a massless spinor particle, depend on the parameters that characterize the scalar-tensor domain wall. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0104038v2-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0104038v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 February, 2002; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 April, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2001. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">LATEX file, 21 pages, revised version to appear in Phys. Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. D65 (2002) 104027 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0101039">arXiv:gr-qc/0101039</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0101039">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0101039">ps</a>, <a href="https://arxiv.org/format/gr-qc/0101039">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.67.123509">10.1103/PhysRevD.67.123509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dilatonic current-carrying cosmic strings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Peter%2C+P">Patrick Peter</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=de+Andrade%2C+V+C">V. C. de Andrade</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0101039v3-abstract-short" style="display: inline;"> We investigate the nature of ordinary cosmic vortices in some scalar-tensor extensions of gravity. We find solutions for which the dilaton field condenses inside the vortex core. These solutions can be interpreted as raising the degeneracy between the eigenvalues of the effective stress-energy tensor, namely the energy per unit length U and the tension T, by picking a privileged spacelike or tim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0101039v3-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0101039v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0101039v3-abstract-full" style="display: none;"> We investigate the nature of ordinary cosmic vortices in some scalar-tensor extensions of gravity. We find solutions for which the dilaton field condenses inside the vortex core. These solutions can be interpreted as raising the degeneracy between the eigenvalues of the effective stress-energy tensor, namely the energy per unit length U and the tension T, by picking a privileged spacelike or timelike coordinate direction; in the latter case, a phase frequency threshold occurs that is similar to what is found in ordinary neutral current-carrying cosmic strings. We find that the dilaton contribution for the equation of state, once averaged along the string worldsheet, vanishes, leading to an effective Nambu-Goto behavior of such a string network in cosmology, i.e. on very large scales. It is found also that on small scales, the energy per unit length and tension depend on the string internal coordinates in such a way as to permit the existence of centrifugally supported equilibrium configuration, also known as vortons, whose stability, depending on the very short distance (unknown) physics, can lead to catastrophic consequences on the evolution of the Universe. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0101039v3-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0101039v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 January, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2001. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, ReVTeX, 2 figures, minor typos corrected. This version to appear in Phys. Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. D67 (2003) 123509 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0012050">arXiv:gr-qc/0012050</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0012050">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0012050">ps</a>, <a href="https://arxiv.org/format/gr-qc/0012050">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0217732301004662">10.1142/S0217732301004662 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Vacuum Polarization in the Spacetime of a Scalar-Tensor Cosmic String </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Bezerra%2C+V+B">V. B. Bezerra</a>, <a href="/search/gr-qc?searchtype=author&query=Filho%2C+R+M+T">R. M. Teixeira Filho</a>, <a href="/search/gr-qc?searchtype=author&query=Grebot%2C+G">G. Grebot</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0012050v1-abstract-short" style="display: inline;"> We study the vacuum polarization effect in the spacetime generated by a magnetic flux cosmic string in the framework of a scalar-tensor gravity. The vacuum expectation values of the energy-momentum tensor of a conformally coupled scalar field are calculated. The dilaton's contribution to the vacuum polarization effect is shown explicitly. </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0012050v1-abstract-full" style="display: none;"> We study the vacuum polarization effect in the spacetime generated by a magnetic flux cosmic string in the framework of a scalar-tensor gravity. The vacuum expectation values of the energy-momentum tensor of a conformally coupled scalar field are calculated. The dilaton's contribution to the vacuum polarization effect is shown explicitly. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0012050v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0012050v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 December, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, LATEX file, 2 eps figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Mod.Phys.Lett.A16:1565-1572,2001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0003041">arXiv:gr-qc/0003041</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0003041">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0003041">ps</a>, <a href="https://arxiv.org/format/gr-qc/0003041">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Astrophysics">astro-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0264-9381/17/15/313">10.1088/0264-9381/17/15/313 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Cosmic String Wakes in Scalar-Tensor Gravities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Masalskiene%2C+S+R+M">S. R. M. Masalskiene</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0003041v2-abstract-short" style="display: inline;"> The formation and evolution of cosmic string wakes in the framework of a scalar-tensor gravity are investigated in this work. We consider a simple model in which cold dark matter flows past an ordinary string and we treat this motion in the Zel'dovich approximation. We make a comaprison between our results and previous results obtained in the context of General Relativity. We propose a mechanism… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0003041v2-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0003041v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0003041v2-abstract-full" style="display: none;"> The formation and evolution of cosmic string wakes in the framework of a scalar-tensor gravity are investigated in this work. We consider a simple model in which cold dark matter flows past an ordinary string and we treat this motion in the Zel'dovich approximation. We make a comaprison between our results and previous results obtained in the context of General Relativity. We propose a mechanism in which the contribution of the scalar field to the evolution of the wakes may lead to a cosmological observation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0003041v2-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0003041v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2000; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 March, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Replaced version to be published in the Classical and Quantum Gravity</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Class.Quant.Grav. 17 (2000) 3055 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/0002054">arXiv:gr-qc/0002054</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/0002054">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/0002054">ps</a>, <a href="https://arxiv.org/format/gr-qc/0002054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0550-3213(00)00282-0">10.1016/S0550-3213(00)00282-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Current-Carrying Cosmic Strings in Scalar-Tensor Gravities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Ferreira%2C+C+N">C. N. Ferreira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=Helayel-Neto%2C+J+A">J. A. Helayel-Neto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/0002054v1-abstract-short" style="display: inline;"> We study the modifications on the metric of an isolated self-gravitating bosonic superconducting cosmic string in a scalar-tensor gravity in the weak-field approximation. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. The metric is derived by means of a matching at the string radius with a most gen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0002054v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/0002054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/0002054v1-abstract-full" style="display: none;"> We study the modifications on the metric of an isolated self-gravitating bosonic superconducting cosmic string in a scalar-tensor gravity in the weak-field approximation. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. The metric is derived by means of a matching at the string radius with a most general static and cylindrically symmetric solution of the Einstein-Maxwell-scalar field equations. We show that this metric depends on five parameters which are related to the string's internal structure and to the solution of the scalar field. We compare our results with those obtained in the framework of General Relativity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/0002054v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/0002054v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 February, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, no figures, LATEX file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys. B581 (2000) 165-178 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9910021">arXiv:gr-qc/9910021</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9910021">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9910021">ps</a>, <a href="https://arxiv.org/format/gr-qc/9910021">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/9789812792129_0038">10.1142/9789812792129_0038 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dilatonic, Current-Carrying Cosmic String </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Ferreira%2C+C+N">C. N. Ferreira</a>, <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a>, <a href="/search/gr-qc?searchtype=author&query=Helayel-Neto%2C+J+A">J. A. Helayel-Neto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9910021v1-abstract-short" style="display: inline;"> We study the implications of a scalar-tensorial gravity for the metric of an isolated self-gravitating superconducting cosmic string. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. We derive the metric in the weak-field approximation and we analyse the behaviour of light in this spacetime. We end w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9910021v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9910021v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9910021v1-abstract-full" style="display: none;"> We study the implications of a scalar-tensorial gravity for the metric of an isolated self-gravitating superconducting cosmic string. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. We derive the metric in the weak-field approximation and we analyse the behaviour of light in this spacetime. We end with some discussions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9910021v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9910021v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 October, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pp, Latex, no figures, based on a talk given by M. E. X. Guimaraes at the COSMO 99, 27/9 to 02/10/99, ICTP, Trieste, It</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9702027">arXiv:gr-qc/9702027</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9702027">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9702027">ps</a>, <a href="https://arxiv.org/format/gr-qc/9702027">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0370-2693(97)00240-2">10.1016/S0370-2693(97)00240-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Semiclassical Effects Induced by Aharonov-Bohm Interaction Between a Cosmic String and a Scalar Field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9702027v1-abstract-short" style="display: inline;"> In the context of the vacuum polarization effect, we consider the backreaction of the energy-momentum tensor of a charged scalar field on the background metric of a cosmic string carrying a magnetic flux $桅$. Working within the semiclassical approach to the Einstein eqs. we find the first-order (in $\hbar$) metric associated to the magnetic flux cosmic string. We show that the contribution to th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9702027v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9702027v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9702027v1-abstract-full" style="display: none;"> In the context of the vacuum polarization effect, we consider the backreaction of the energy-momentum tensor of a charged scalar field on the background metric of a cosmic string carrying a magnetic flux $桅$. Working within the semiclassical approach to the Einstein eqs. we find the first-order (in $\hbar$) metric associated to the magnetic flux cosmic string. We show that the contribution to the vacuum polarization effect coming from the Aharonov-Bohm interaction is larger than the one coming from the non-trivial gravitational interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9702027v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9702027v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 February, 1997; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 1997. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, no figures, accepted for publication in Phys. Letters B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett. B398 (1997) 281-284 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9612050">arXiv:gr-qc/9612050</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9612050">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9612050">ps</a>, <a href="https://arxiv.org/format/gr-qc/9612050">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Semiclassical Gravitational Effects in the Spacetime of a Magnetic Flux Cosmic String </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimaraes%2C+M+E+X">M. E. X. Guimaraes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9612050v1-abstract-short" style="display: inline;"> It is well-known that some physical effects may arise in the spacetime of a straigth cosmic string due to its global conic properties. Among these effects, the vacuum polarization effect has been extensively studied in the litterature. In papers of reference [4] a more general situation has been considered in which the cosmic string carries a magnetic flux $桅$ and interacts with a charged scalar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9612050v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9612050v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9612050v1-abstract-full" style="display: none;"> It is well-known that some physical effects may arise in the spacetime of a straigth cosmic string due to its global conic properties. Among these effects, the vacuum polarization effect has been extensively studied in the litterature. In papers of reference [4] a more general situation has been considered in which the cosmic string carries a magnetic flux $桅$ and interacts with a charged scalar field. In this case, the vacuum polarization arises both via non-trivial gravitational interaction (i.e, the conical structure) and via Aharonov-Bohm interaction. In papers [4] the non vanishing VEV of the energy-momentum tensor of the scalar field were computed. However, this energy-momentum tensor should, in principle, be taken into account to determine the spacetime associated with the magnetic flux cosmic string. Using the semiclassical approach to the Einstein eqs. we find the first-order (in $\hbar$) metric associated to the cosmic string and we show that the gravitational force resulting from the backreaction of the $< T^渭_谓 >$ is attractive or repulsive depending on whether the magnetic flux is absent or present, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9612050v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9612050v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 December, 1996; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 1996. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">LATEX, 6 pages, to be published in the Proceedings of the Spanish Relativity Meeting 1996 (ERE-96), Valencia, Spain</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9610007">arXiv:gr-qc/9610007</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9610007">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9610007">ps</a>, <a href="https://arxiv.org/format/gr-qc/9610007">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0264-9381/14/2/016">10.1088/0264-9381/14/2/016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Cosmic String in Scalar-Tensor Gravities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">Maria Em铆lia X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9610007v1-abstract-short" style="display: inline;"> We consider a local cosmic string described by the Abelian-Higgs model in the framework of scalar-tensor gravities. We find the metric of the cosmic string in the weak-field approximation. The propagation of particles and light is analysed in this background. This analysis shows that the (unperturbed) cosmic string in scalar-tensor theories presents some analogous features to the wiggly cosmic s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9610007v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9610007v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9610007v1-abstract-full" style="display: none;"> We consider a local cosmic string described by the Abelian-Higgs model in the framework of scalar-tensor gravities. We find the metric of the cosmic string in the weak-field approximation. The propagation of particles and light is analysed in this background. This analysis shows that the (unperturbed) cosmic string in scalar-tensor theories presents some analogous features to the wiggly cosmic string in General Relativity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9610007v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9610007v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 1996; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 1996. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, Latex, no figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Class.Quant.Grav. 14 (1997) 435-442 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9511015">arXiv:gr-qc/9511015</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9511015">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9511015">ps</a>, <a href="https://arxiv.org/format/gr-qc/9511015">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> </div> <p class="title is-5 mathjax"> Cosmic String in Scalar-Tensor Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9511015v1-abstract-short" style="display: inline;"> The gravitational properties of a local cosmic string in the framework of scalar-tensor gravity are examined. We find the metric in the weak-field approximation and we show that, contrary to the General Relativity case, the cosmic string in scalar-tensor gravitation exerces a force on non-relativistic, neutral test particle. This force is proportional to the derivative of the conformal factor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9511015v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9511015v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9511015v1-abstract-full" style="display: none;"> The gravitational properties of a local cosmic string in the framework of scalar-tensor gravity are examined. We find the metric in the weak-field approximation and we show that, contrary to the General Relativity case, the cosmic string in scalar-tensor gravitation exerces a force on non-relativistic, neutral test particle. This force is proportional to the derivative of the conformal factor $A^{2}(蠁)$ and it is always attractive. Moreover, this force could have played an important role at the Early Universe, although nowadays it can be neglegible. It is also shown that the angular separation $未\varphi$ remains unaltered for scalar-tensor cosmic strings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9511015v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9511015v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 November, 1995; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 1995. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, LATEX, no figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> GRC 95/11/01 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-th/9506050">arXiv:hep-th/9506050</a> <span> [<a href="https://arxiv.org/pdf/hep-th/9506050">pdf</a>, <a href="https://arxiv.org/ps/hep-th/9506050">ps</a>, <a href="https://arxiv.org/format/hep-th/9506050">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.52.6057">10.1103/PhysRevD.52.6057 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Non-Abelian, Self-Dual Chern-Simons Vortices Coupled to Gravity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a>, <a href="/search/gr-qc?searchtype=author&query=London%2C+L+A+J">L. A. J. London</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-th/9506050v1-abstract-short" style="display: inline;"> In this article we consider $SU(2)$ Chern-Simons/Higgs theory coupled to gravity in three-dimensions. It is shown that for a cylindrically symmetric vortex both the Einstein equations and the field equations can be reduced to a set of first-order Bogomol'nyi equations provided that we choose a specific eighth-order potential. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-th/9506050v1-abstract-full" style="display: none;"> In this article we consider $SU(2)$ Chern-Simons/Higgs theory coupled to gravity in three-dimensions. It is shown that for a cylindrically symmetric vortex both the Einstein equations and the field equations can be reduced to a set of first-order Bogomol'nyi equations provided that we choose a specific eighth-order potential. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-th/9506050v1-abstract-full').style.display = 'none'; document.getElementById('hep-th/9506050v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 June, 1995; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 1995. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, LATEX, no figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> GCR-95/06/01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. D52 (1995) 6057-6064 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/gr-qc/9502003">arXiv:gr-qc/9502003</a> <span> [<a href="https://arxiv.org/pdf/gr-qc/9502003">pdf</a>, <a href="https://arxiv.org/ps/gr-qc/9502003">ps</a>, <a href="https://arxiv.org/format/gr-qc/9502003">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0264-9381/12/7/012">10.1088/0264-9381/12/7/012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Vacuum Polarization at Finite Temperature around a Magnetic Flux Cosmic String </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/gr-qc?searchtype=author&query=Guimar%C3%A3es%2C+M+E+X">M. E. X. Guimar茫es</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="gr-qc/9502003v1-abstract-short" style="display: inline;"> We consider a general situation where a charged massive scalar field $蠁(x)$ at finite temperature interacts with a magnetic flux cosmic string. We determine a general expression for the Euclidean thermal Green's function of the massive scalar field and a handy expression for a massless scalar field. With this result, we evaluate the thermal average $<蠁^{2}(x)>$ and the thermal average of the energ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9502003v1-abstract-full').style.display = 'inline'; document.getElementById('gr-qc/9502003v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="gr-qc/9502003v1-abstract-full" style="display: none;"> We consider a general situation where a charged massive scalar field $蠁(x)$ at finite temperature interacts with a magnetic flux cosmic string. We determine a general expression for the Euclidean thermal Green's function of the massive scalar field and a handy expression for a massless scalar field. With this result, we evaluate the thermal average $<蠁^{2}(x)>$ and the thermal average of the energy-momentum tensor of a nonconformal massless scalar field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('gr-qc/9502003v1-abstract-full').style.display = 'none'; document.getElementById('gr-qc/9502003v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 1995; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 1995. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, latex, no figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> GCR - 95 - 02 - 01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Class.Quant.Grav.12:1705-1714,1995 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 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