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style='text-align: center' valign="center"> <a href="/events/?year=2024&semester=Fall&name=N3AS">Fall 2024</a> </td> <td style='text-align: right;' valign="center"> <a href="/events/?year=2025&semester=Spring&name=N3AS">Spring 2025 >></a> </td> </tr> <tr class='hide-for-print'> <td style='text-align: center; padding-top: 0;' colspan=3><small><a href="https://www.physics.wisc.edu/events-cal-subscribe?name=N3AS">Subscribe your calendar</a> or <a href="https://lists.physics.wisc.edu/listinfo/twap">receive email announcements</a> of events</small></td> </tr> </table> <div class='events-body'> <dd class='event'><font style="font-size:1.1em;"><b>SIMP Miracles and WIMP Dead Ends: Navigating the Freeze-Out of MeV Dark Matter</b></font></dd> <dd><b>Date:</b> <b><a href="/events/?date=2024-10-29&name=N3AS">Tuesday, October 29th</a></b></dd> <dd><b>Time:</b> 2:00 pm - 3:00 pm</dd> <dd><b>Place:</b> <span id='obslnk_1'></span></dd> <dd><b>Speaker:</b> Joseph Pradler, HEPHY, Vienna</dd> <dd><b>Abstract:</b> In this talk we consider both the possibility of dark matter being either a strongly or a weakly interacting thermal relic. For strongly interacting massive particles (SIMPs) we study the influence of bound states X on their cosmology, finding a "catalysis" of mass-depleting processes in the hidden sector, adding a qualitative change to SIMP freeze-out once X exist, hence broadening the options for SIMP dark matter. In turn, for weakly interacting massive particles (WIMPs) we study the low mass frontier of thermal relics where freeze-out happens during the cosmological non-trivial epochs of neutrino decoupling and primordial nucleosynthesis. Here we present a first self-consistent calculation of the cosmological Neff parameter that is expected to be measured with much improved accuracy in upcoming CMB experiments.<br> <br> <br> NOTE: All participants and hosts are now required to sign into a Zoom account prior to joining meetings hosted by UC Berkeley.<br> <br> Join Zoom Meeting:<br> <span id='obslnk_0'></span> <br> Meeting ID: 912 3071 4547</dd> <dd><b>Host:</b> Balantekin</dd> <dd class='hide-for-print'><small><a href="/events/ical.php?id=8980">Add this event to your calendar</a></small></dd> </div> </div> <script> window.addEventListener('DOMContentLoaded', function() { var obslnk_url; obslnk_url = atob('aHR0cHM6Ly9iZXJrZWxleS56b29tLnVzL2ovOTEyMzA3MTQ1NDc8YnI+'); var e = document.getElementById('obslnk_0'); if(e) e.innerHTML = '<a href="' + obslnk_url + '">' + obslnk_url + '</a>'; obslnk_url = atob('aHR0cHM6Ly9iZXJrZWxleS56b29tLnVzL2ovOTEyMzA3MTQ1NDc='); var e = document.getElementById('obslnk_1'); if(e) e.innerHTML = 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