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This white paper is the result of a collaborative effort that involved hundreds of theoretical astroparticle physicists and cosmologists, under the coordination of the European Consortium for Astroparticle Theory (EuCAPT). Addressed to the whole astroparticle physics community, it explores upcoming theoretical opportunities and challenges for our field of research, with particular emphasis on the possible synergies among different subfields, and the prospects for solving the most fundamental open questions with multi-messenger observations. Alves Batista, R.; Amin, M.A.; Barenboim, G.; Bartolo, N.; Baumann, D.; Bauswein, A.; Bellini, E.; Benisty, D.; Bertone, G.; Blasi, P.; Böhmer, C.G.; Bošnjak, Ž.; Bringmann, T.; Burrage, C.; Bustamante, M.; Calderón Bustillo, J.; Byrnes, C.T.; Calore, F.; Catena, R.; Cerdeño, D.G.; Cerri, S.S.; Chianese, M.; Clough, K.; Cole, A.; Coloma, P.; Coogan, A.; Covi, L.; Cutting, D.; Davis, A.C.; de Rham, C.; di Matteo, A.; Domènech, G.; Drewes, M.; Dietrich, T.; Edwards, T.D.P.; Esteban, I.; Erdem, R.; Evoli, C.; Fasiello, M.; Feeney, S.M.; Ferreira, R.Z.; Fialkov, A.; Fornengo, N.; Gabici, S.; Galatyuk, T.; Gaggero, D.; Grasso, D.; Guépin, C.; Harz, J.; Herrero-Valea, M.; Hinderer, T.; Hogg, N.B.; Hooper, D.C.; Iocco, F.; Isern, J.; Karchev, K.; Kavanagh, B.J.; Korsmeier, M.; Kotera, K.; Koyama, K.; Krishnan, B.; Lesgourgues, J.; Levi Said, J.; Lombriser, L.; Lorenz, C.S.; Manconi, S.; Mapelli, M.; Marcowith, A.; Markoff, S.B.; Marsh, D.J.E.; Martinelli, M.; Martins, C.J.A.P.; Matthews, J.H.; Meli, A.; Mena, O.; Mifsud, J.; Miller Bertolami, M.M.; Millington, P.; Moesta, P.; Nippel, K.; Niro, V.; O'Connor, E.; Oikonomou, F.; Paganini, C.F.; Pagliaroli, G.; Pani, P.; Pfrommer, C.; Pascoli, S.; Pinol, L.; Pizzuti, L.; Porto, R.A.; Pound, A.; Quevedo, F.; Raffelt, G.G.; Raccanelli, A.; Ramirez-Ruiz, E.; Raveri, M.; Renaux-Petel, S.; Ricciardone, A.; Khalifeh, A. 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var link = document.getElementById('link'); var extension = document.getElementById('extension'); if (more.style.display=='none'){ more.style.display = ''; extension.style.display = 'none'; link.innerHTML = "Hide" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Show all 137 authors" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = ""; toggle_authors_visibility(); } </script> <a name="show_hide" /><a href="https://cds.cern.ch/search?f=author&p=Alves%20Batista%2C%20R.&ln=en">Alves Batista, R.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Amin%2C%20M.A.&ln=en">Amin, M.A.</a> (Rice U.) ; <a href="https://cds.cern.ch/search?f=author&p=Barenboim%2C%20G.&ln=en">Barenboim, G.</a> (Valencia U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bartolo%2C%20N.&ln=en">Bartolo, N.</a> (U. Padua, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Baumann%2C%20D.&ln=en">Baumann, D.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Bauswein%2C%20A.&ln=en">Bauswein, A.</a> (Darmstadt, GSI) ; <a href="https://cds.cern.ch/search?f=author&p=Bellini%2C%20E.&ln=en">Bellini, E.</a> (Geneva U., Dept. Theor. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Benisty%2C%20D.&ln=en">Benisty, D.</a> (Cambridge U., DAMTP ; Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Bertone%2C%20G.&ln=en">Bertone, G.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Blasi%2C%20P.&ln=en">Blasi, P.</a> (GSSI, Aquila ; Gran Sasso)<span id="more" style=""> ; <a href="https://cds.cern.ch/search?f=author&p=B%C3%B6hmer%2C%20C.G.&ln=en">Böhmer, C.G.</a> (University Coll. London) ; <a href="https://cds.cern.ch/search?f=author&p=Bo%C5%A1njak%2C%20%C5%BD.&ln=en">Bošnjak, Ž.</a> (Zagreb U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bringmann%2C%20T.&ln=en">Bringmann, T.</a> (Oslo U.) ; <a href="https://cds.cern.ch/search?f=author&p=Burrage%2C%20C.&ln=en">Burrage, C.</a> (Nottingham U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bustamante%2C%20M.&ln=en">Bustamante, M.</a> (Bohr Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Calder%C3%B3n%20Bustillo%2C%20J.&ln=en">Calderón Bustillo, J.</a> (Santiago de Compostela U., IGFAE ; Taiwan, Natl. Taiwan U.) ; <a href="https://cds.cern.ch/search?f=author&p=Byrnes%2C%20C.T.&ln=en">Byrnes, C.T.</a> (Sussex U.) ; <a href="https://cds.cern.ch/search?f=author&p=Calore%2C%20F.&ln=en">Calore, F.</a> (Annecy, LAPTH) ; <a href="https://cds.cern.ch/search?f=author&p=Catena%2C%20R.&ln=en">Catena, R.</a> (Chalmers U. Tech.) ; <a href="https://cds.cern.ch/search?f=author&p=Cerde%C3%B1o%2C%20D.G.&ln=en">Cerdeño, D.G.</a> (Madrid, IFT ; Madrid, Autonoma U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cerri%2C%20S.S.&ln=en">Cerri, S.S.</a> (Princeton U., Astrophys. Sci. Dept. ; OCA, Nice, Lab. Lagrange) ; <a href="https://cds.cern.ch/search?f=author&p=Chianese%2C%20M.&ln=en">Chianese, M.</a> (Naples U. ; INFN, Naples) ; <a href="https://cds.cern.ch/search?f=author&p=Clough%2C%20K.&ln=en">Clough, K.</a> (U. Oxford, Astrophys. Dept.) ; <a href="https://cds.cern.ch/search?f=author&p=Cole%2C%20A.&ln=en">Cole, A.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Coloma%2C%20P.&ln=en">Coloma, P.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Coogan%2C%20A.&ln=en">Coogan, A.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Covi%2C%20L.&ln=en">Covi, L.</a> (Gottingen U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cutting%2C%20D.&ln=en">Cutting, D.</a> (U. Helsinki (main)) ; <a href="https://cds.cern.ch/search?f=author&p=Davis%2C%20A.C.&ln=en">Davis, A.C.</a> (Cambridge U., DAMTP) ; <a href="https://cds.cern.ch/search?f=author&p=de%20Rham%2C%20C.&ln=en">de Rham, C.</a> (Imperial Coll., London) ; <a href="https://cds.cern.ch/search?f=author&p=di%20Matteo%2C%20A.&ln=en">di Matteo, A.</a> (INFN, Turin) ; <a href="https://cds.cern.ch/search?f=author&p=Dom%C3%A8nech%2C%20G.&ln=en">Domènech, G.</a> (INFN, Padua) ; <a href="https://cds.cern.ch/search?f=author&p=Drewes%2C%20M.&ln=en">Drewes, M.</a> (Louvain U., CP3) ; <a href="https://cds.cern.ch/search?f=author&p=Dietrich%2C%20T.&ln=en">Dietrich, T.</a> (Potsdam U. ; Potsdam, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Edwards%2C%20T.D.P.&ln=en">Edwards, T.D.P.</a> (Stockholm U.) ; <a href="https://cds.cern.ch/search?f=author&p=Esteban%2C%20I.&ln=en">Esteban, I.</a> (Ohio State U., CCAPP) ; <a href="https://cds.cern.ch/search?f=author&p=Erdem%2C%20R.&ln=en">Erdem, R.</a> (Izmir Inst. Tech.) ; <a href="https://cds.cern.ch/search?f=author&p=Evoli%2C%20C.&ln=en">Evoli, C.</a> (GSSI, Aquila ; Gran Sasso) ; <a href="https://cds.cern.ch/search?f=author&p=Fasiello%2C%20M.&ln=en">Fasiello, M.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Feeney%2C%20S.M.&ln=en">Feeney, S.M.</a> (University Coll. London) ; <a href="https://cds.cern.ch/search?f=author&p=Ferreira%2C%20R.Z.&ln=en">Ferreira, R.Z.</a> (Barcelona, IFAE) ; <a href="https://cds.cern.ch/search?f=author&p=Fialkov%2C%20A.&ln=en">Fialkov, A.</a> (Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Fornengo%2C%20N.&ln=en">Fornengo, N.</a> (INFN, Turin) ; <a href="https://cds.cern.ch/search?f=author&p=Gabici%2C%20S.&ln=en">Gabici, S.</a> (APC, Paris) ; <a href="https://cds.cern.ch/search?f=author&p=Galatyuk%2C%20T.&ln=en">Galatyuk, T.</a> (Darmstadt, GSI ; Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Gaggero%2C%20D.&ln=en">Gaggero, D.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Grasso%2C%20D.&ln=en">Grasso, D.</a> (Pisa U.) ; <a href="https://cds.cern.ch/search?f=author&p=Gu%C3%A9pin%2C%20C.&ln=en">Guépin, C.</a> (Maryland U., College Park) ; <a href="https://cds.cern.ch/search?f=author&p=Harz%2C%20J.&ln=en">Harz, J.</a> (Munich, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Herrero-Valea%2C%20M.&ln=en">Herrero-Valea, M.</a> (SISSA, Trieste ; IFPU, Trieste ; INFN, Trieste) ; <a href="https://cds.cern.ch/search?f=author&p=Hinderer%2C%20T.&ln=en">Hinderer, T.</a> (Utrecht U.) ; <a href="https://cds.cern.ch/search?f=author&p=Hogg%2C%20N.B.&ln=en">Hogg, N.B.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Hooper%2C%20D.C.&ln=en">Hooper, D.C.</a> (Brussels U.) ; <a href="https://cds.cern.ch/search?f=author&p=Iocco%2C%20F.&ln=en">Iocco, F.</a> (Naples U. ; INFN, Naples) ; <a href="https://cds.cern.ch/search?f=author&p=Isern%2C%20J.&ln=en">Isern, J.</a> (ICE, Bellaterra ; Barcelona, IEEC ; Barcelona, Autonoma U.) ; <a href="https://cds.cern.ch/search?f=author&p=Karchev%2C%20K.&ln=en">Karchev, K.</a> (SISSA, Trieste) ; <a href="https://cds.cern.ch/search?f=author&p=Kavanagh%2C%20B.J.&ln=en">Kavanagh, B.J.</a> (Cantabria Inst. of Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Korsmeier%2C%20M.&ln=en">Korsmeier, M.</a> (Stockholm U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kotera%2C%20K.&ln=en">Kotera, K.</a> (Paris, Inst. Astrophys. ; Vrije U., Brussels) ; <a href="https://cds.cern.ch/search?f=author&p=Koyama%2C%20K.&ln=en">Koyama, K.</a> (Portsmouth U., ICG) ; <a href="https://cds.cern.ch/search?f=author&p=Krishnan%2C%20B.&ln=en">Krishnan, B.</a> (Hannover, Max Planck Inst. Grav. ; Hannover U. ; Nijmegen U., IMAPP) ; <a href="https://cds.cern.ch/search?f=author&p=Lesgourgues%2C%20J.&ln=en">Lesgourgues, J.</a> (RWTH Aachen U.) ; <a href="https://cds.cern.ch/search?f=author&p=Levi%20Said%2C%20J.&ln=en">Levi Said, J.</a> (U. Malta ; Malta U.) ; <a href="https://cds.cern.ch/search?f=author&p=Lombriser%2C%20L.&ln=en">Lombriser, L.</a> (Geneva U., Dept. Theor. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Lorenz%2C%20C.S.&ln=en">Lorenz, C.S.</a> (Zurich, ETH) ; <a href="https://cds.cern.ch/search?f=author&p=Manconi%2C%20S.&ln=en">Manconi, S.</a> (RWTH Aachen U.) ; <a href="https://cds.cern.ch/search?f=author&p=Mapelli%2C%20M.&ln=en">Mapelli, M.</a> (U. Padua, Dept. Phys. Astron. ; INFN, Padua ; Padua Observ.) ; <a href="https://cds.cern.ch/search?f=author&p=Marcowith%2C%20A.&ln=en">Marcowith, A.</a> (U. Montpellier 2, LUPM) ; <a href="https://cds.cern.ch/search?f=author&p=Markoff%2C%20S.B.&ln=en">Markoff, S.B.</a> (U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Marsh%2C%20D.J.E.&ln=en">Marsh, D.J.E.</a> (King's Coll. London) ; <a href="https://cds.cern.ch/search?f=author&p=Martinelli%2C%20M.&ln=en">Martinelli, M.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Martins%2C%20C.J.A.P.&ln=en">Martins, C.J.A.P.</a> (Porto U., Astron. Dept. ; Porto U.) ; <a href="https://cds.cern.ch/search?f=author&p=Matthews%2C%20J.H.&ln=en">Matthews, J.H.</a> (Cambridge U., Inst. of Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Meli%2C%20A.&ln=en">Meli, A.</a> (Liege U. ; North Carolina A-T State U.) ; <a href="https://cds.cern.ch/search?f=author&p=Mena%2C%20O.&ln=en">Mena, O.</a> (Valencia U., IFIC) ; <a href="https://cds.cern.ch/search?f=author&p=Mifsud%2C%20J.&ln=en">Mifsud, J.</a> (U. Malta ; Malta U.) ; <a href="https://cds.cern.ch/search?f=author&p=Miller%20Bertolami%2C%20M.M.&ln=en">Miller Bertolami, M.M.</a> (Buenos Aires, CONICET ; La Plata U.) ; <a href="https://cds.cern.ch/search?f=author&p=Millington%2C%20P.&ln=en">Millington, P.</a> (Nottingham U.) ; <a href="https://cds.cern.ch/search?f=author&p=Moesta%2C%20P.&ln=en">Moesta, P.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Nippel%2C%20K.&ln=en">Nippel, K.</a> (RWTH Aachen U.) ; <a href="https://cds.cern.ch/search?f=author&p=Niro%2C%20V.&ln=en">Niro, V.</a> (APC, Paris) ; <a href="https://cds.cern.ch/search?f=author&p=O%27Connor%2C%20E.&ln=en">O'Connor, E.</a> (Stockholm U.) ; <a href="https://cds.cern.ch/search?f=author&p=Oikonomou%2C%20F.&ln=en">Oikonomou, F.</a> (Norwegian U. Sci. Tech.) ; <a href="https://cds.cern.ch/search?f=author&p=Paganini%2C%20C.F.&ln=en">Paganini, C.F.</a> (Potsdam, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Pagliaroli%2C%20G.&ln=en">Pagliaroli, G.</a> (GSSI, Aquila ; Gran Sasso) ; <a href="https://cds.cern.ch/search?f=author&p=Pani%2C%20P.&ln=en">Pani, P.</a> (Rome U.) ; <a href="https://cds.cern.ch/search?f=author&p=Pfrommer%2C%20C.&ln=en">Pfrommer, C.</a> (Potsdam, Astrophys. Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Pascoli%2C%20S.&ln=en">Pascoli, S.</a> (Bologna U. ; INFN, Bologna ; Durham U., IPPP) ; <a href="https://cds.cern.ch/search?f=author&p=Pinol%2C%20L.&ln=en">Pinol, L.</a> (Madrid, IFT) ; <a href="https://cds.cern.ch/search?f=author&p=Pizzuti%2C%20L.&ln=en">Pizzuti, L.</a> (Cagliari Observ.) ; <a href="https://cds.cern.ch/search?f=author&p=Porto%2C%20R.A.&ln=en">Porto, R.A.</a> (DESY) ; <a href="https://cds.cern.ch/search?f=author&p=Pound%2C%20A.&ln=en">Pound, A.</a> (Southampton U.) ; <a href="https://cds.cern.ch/search?f=author&p=Quevedo%2C%20F.&ln=en">Quevedo, F.</a> (Cambridge U., DAMTP) ; <a href="https://cds.cern.ch/search?f=author&p=Raffelt%2C%20G.G.&ln=en">Raffelt, G.G.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Raccanelli%2C%20A.&ln=en">Raccanelli, A.</a> (U. Padua, Dept. Phys. Astron. ; INFN, Padua) ; <a href="https://cds.cern.ch/search?f=author&p=Ramirez-Ruiz%2C%20E.&ln=en">Ramirez-Ruiz, E.</a> (UC, Santa Cruz, Astron. Astrophys. ; DARK Cosmology Ctr.) ; <a href="https://cds.cern.ch/search?f=author&p=Raveri%2C%20M.&ln=en">Raveri, M.</a> (Pennsylvania U.) ; <a href="https://cds.cern.ch/search?f=author&p=Renaux-Petel%2C%20S.&ln=en">Renaux-Petel, S.</a> (Paris, Inst. Astrophys.) ; <a href="https://cds.cern.ch/search?f=author&p=Ricciardone%2C%20A.&ln=en">Ricciardone, A.</a> (U. Padua, Dept. Phys. Astron. ; INFN, Padua) ; <a href="https://cds.cern.ch/search?f=author&p=Khalifeh%2C%20A.%20Rida&ln=en">Khalifeh, A. Rida</a> (ICC, Barcelona U.) ; <a href="https://cds.cern.ch/search?f=author&p=Riotto%2C%20A.&ln=en">Riotto, A.</a> (Geneva U., CAP) ; <a href="https://cds.cern.ch/search?f=author&p=Roiban%2C%20R.&ln=en">Roiban, R.</a> (Penn State U.) ; <a href="https://cds.cern.ch/search?f=author&p=Rubio%2C%20J.&ln=en">Rubio, J.</a> (Lisbon, CENTRA) ; <a href="https://cds.cern.ch/search?f=author&p=Sahl%C3%A9n%2C%20M.&ln=en">Sahlén, M.</a> (Uppsala U. ; AMACC, Uppsala) ; <a href="https://cds.cern.ch/search?f=author&p=Sabti%2C%20N.&ln=en">Sabti, N.</a> (King's Coll. London) ; <a href="https://cds.cern.ch/search?f=author&p=Sagunski%2C%20L.&ln=en">Sagunski, L.</a> (Frankfurt U.) ; <a href="https://cds.cern.ch/search?f=author&p=%C5%A0ar%C4%8Devi%C4%87%2C%20N.&ln=en">Šarčević, N.</a> (Newcastle U., United Kingdom, Sch. Math. Stat.) ; <a href="https://cds.cern.ch/search?f=author&p=Schmitz%2C%20K.&ln=en">Schmitz, K.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Schwaller%2C%20P.&ln=en">Schwaller, P.</a> (U. Mainz, PRISMA) ; <a href="https://cds.cern.ch/search?f=author&p=Schwetz%2C%20T.&ln=en">Schwetz, T.</a> (KIT, Karlsruhe, IAP) ; <a href="https://cds.cern.ch/search?f=author&p=Sedrakian%2C%20A.&ln=en">Sedrakian, A.</a> (Frankfurt U., FIAS ; U. Wroclaw (main)) ; <a href="https://cds.cern.ch/search?f=author&p=Sellentin%2C%20E.&ln=en">Sellentin, E.</a> (Leiden Observ.) ; <a href="https://cds.cern.ch/search?f=author&p=Serenelli%2C%20A.&ln=en">Serenelli, A.</a> (ICE, Bellaterra ; Barcelona, IEEC) ; <a href="https://cds.cern.ch/search?f=author&p=Serpico%2C%20P.D.&ln=en">Serpico, P.D.</a> (Annecy, LAPTH) ; <a href="https://cds.cern.ch/search?f=author&p=Sfakianakis%2C%20E.I.&ln=en">Sfakianakis, E.I.</a> (Barcelona, IFAE) ; <a href="https://cds.cern.ch/search?f=author&p=Shalgar%2C%20S.&ln=en">Shalgar, S.</a> (Bohr Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Silvestri%2C%20A.&ln=en">Silvestri, A.</a> (Leiden U.) ; <a href="https://cds.cern.ch/search?f=author&p=Tamborra%2C%20I.&ln=en">Tamborra, I.</a> (Bohr Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Tanidis%2C%20K.&ln=en">Tanidis, K.</a> (Prague, Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Teresi%2C%20D.&ln=en">Teresi, D.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Tokareva%2C%20A.A.&ln=en">Tokareva, A.A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Tolos%2C%20L.&ln=en">Tolos, L.</a> (ICE, Bellaterra ; Barcelona, IEEC ; Frankfurt U., FIAS ; Stavanger U.) ; <a href="https://cds.cern.ch/search?f=author&p=Trojanowski%2C%20S.&ln=en">Trojanowski, S.</a> (Warsaw, Copernicus Astron. Ctr. ; NCBJ, Warsaw) ; <a href="https://cds.cern.ch/search?f=author&p=Trotta%2C%20R.&ln=en">Trotta, R.</a> (SISSA, Trieste ; Imperial Coll., London) ; <a href="https://cds.cern.ch/search?f=author&p=Uhlemann%2C%20C.&ln=en">Uhlemann, C.</a> (Newcastle U., United Kingdom, Sch. Math. Stat.) ; <a href="https://cds.cern.ch/search?f=author&p=Urban%2C%20F.R.&ln=en">Urban, F.R.</a> (Prague, Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Vernizzi%2C%20F.&ln=en">Vernizzi, F.</a> (IPhT, Saclay) ; <a href="https://cds.cern.ch/search?f=author&p=van%20Vliet%2C%20A.&ln=en">van Vliet, A.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Villante%2C%20F.L.&ln=en">Villante, F.L.</a> (Gran Sasso ; L'Aquila U.) ; <a href="https://cds.cern.ch/search?f=author&p=Vincent%2C%20A.&ln=en">Vincent, A.</a> (Queen's U., Kingston ; Perimeter Inst. Theor. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Vink%2C%20J.&ln=en">Vink, J.</a> (U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Vitagliano%2C%20E.&ln=en">Vitagliano, E.</a> (UCLA) ; <a href="https://cds.cern.ch/search?f=author&p=Weniger%2C%20C.&ln=en">Weniger, C.</a> (Amsterdam U. ; U. Amsterdam, GRAPPA) ; <a href="https://cds.cern.ch/search?f=author&p=Wickenbrock%2C%20Arne&ln=en">Wickenbrock, Arne</a> (Darmstadt, GSI) ; <a href="https://cds.cern.ch/search?f=author&p=Winter%2C%20W.&ln=en">Winter, W.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Zell%2C%20S.&ln=en">Zell, S.</a> (EPFL, Lausanne, LPPC) ; <a href="https://cds.cern.ch/search?f=author&p=Zeng%2C%20M.&ln=en">Zeng, M.</a> (U. Edinburgh, Higgs Ctr. Theor. Phys. ; Taiwan, Natl. Taiwan U. ; Hong Kong, Chinese U.)</span> <span id="extension"></span> <small><i><a id="link" href="#" onclick="toggle_authors_visibility()" style="color:rgb(204,0,0);"></a></i></small><script type="text/javascript">set_up()</script></td></tr>  <script type="text/javascript"> /* * Changes the Imprint title to Date - Duration as requested by RQF0820114 * This is a hack not to touch the general imprint format element */ $(document).ready(function() { var collections = 'PREPRINT'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">2021-10-19</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">134</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">White paper of the European Consortium for Astroparticle Theory (EuCAPT). 135 authors, 400 endorsers, 133 pages, 1382 references</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">astro-ph.CO ; Astrophysics and Astronomy ; astro-ph.HE ; Astrophysics and Astronomy</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the direct detection of gravitational waves with LIGO and Virgo, and many others. This white paper is the result of a collaborative effort that involved hundreds of theoretical astroparticle physicists and cosmologists, under the coordination of the European Consortium for Astroparticle Theory (EuCAPT). Addressed to the whole astroparticle physics community, it explores upcoming theoretical opportunities and challenges for our field of research, with particular emphasis on the possible synergies among different subfields, and the prospects for solving the most fundamental open questions with multi-messenger observations.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/1947430">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">preprint: (License: <a href="http://creativecommons.org/licenses/by-nc-nd/4.0/">CC BY-NC-ND 4.0</a>)</td></tr> </table> <br/><div><div style="clear: both;"> </div></div> <script type="text/javascript"> // Initially hide: $(".longCaption").hide(); // Allow to toggle visibility: $(".toggleLongCaption").toggle(function(){ $(this).siblings(".longCaption").show('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? 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