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Dear All,</div>
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<span style="line-height: 1.38;">We have two seminars this week, whose details are provided below - </span></div>
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<b>Speaker: </b> <b>Basudeb Dasgupta</b> (Tata Institue of Fundamental Research, India) (online)</div>
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<b>Seminar date:</b> <b>10th Mar, Tuesday, 1 pm </b>UK time</div>
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<b>Venue:</b> <b>C12</b> <b>(Physics Building)</b></div>
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<b>Title: Probing Dark Matter with Gravitational Waves from Mergers</b></div>
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<b>Abstract</b>: </div>
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Gravitational waves open new avenues to study dark matter through the dynamics of compact objects. In this talk, we will outline two examples of this new rapidly developing field. First, we will discuss how dark matter captured by neutron stars can induce their
collapse into low-mass black holes, with their mergers detectable by current and future observatories. Such events probe dark matter–nucleon interactions at cross-sections below the neutrino floor and masses spanning GeV to PeV. Existing LIGO/Virgo data already
yield strong bounds, while future detections could reveal dark core collapse and account for puzzles such as the missing pulsars near the Galactic Center. In the second half, I will discuss a more model-independent probe using compact binaries near galactic
centers, which can confirm or rule out parsec-scale density spikes and may be used to constrain broad classes of dark matter models.</div>
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<b>Speaker:</b> <b>John T. Giblin</b> (Kenyon College, United States)</div>
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<b>Seminar date:</b> <b>11th Mar, Wednesday, 2 pm </b>UK time</div>
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<b>Venue:</b> Seminar Room <b>A 113 (Cripps North Building, CAPT)</b></div>
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<b>Title: Primordial Black Holes from Cosmology</b></div>
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<b>Abstract</b>: </div>
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Primordial black holes (PBH) are formed when cosmic-scale over-densities collapse. Unlike astrophysical black holes--formed in the aftermath of large stars--PBH masses are set by the size of the cosmic horizon and can therefore form at any mass range. Among
the mechanisms that would allow for such large horizon-scale overdensities is cosmic preheating. In this talk I will discuss the first simulations that show the formation of primordial black holes in the context of so-called kinetic preheating, a proof-of-concept
that PBH can be formed from cosmological processes. I will also discuss several scenarios in which PBH are not formed and speculate on why some models are successful and some are not.</div>
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<b>Link to join:</b></div>
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<span style="color: black;"> </span><span style="color: rgb(5, 99, 193);"><u><a style="color: rgb(5, 99, 193); margin: 0px;" data-auth="NotApplicable" data-linkindex="0" title="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d" class="OWAAutoLink" id="OWA5468b9f3-82a0-afc0-9b68-98b581602a1e" href="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d">https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d</a></u></span></div>
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<b><i>List of the following four upcoming seminars (not everyone has given us a title yet):</i></b></div>
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17-Mar <b>Miguel Montero</b> (IFT,Madrid)</div>
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24-Mar <b>Sofie Ried</b> (Sheffield) Unimodular time in quantum gravity</div>
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14-Apr <b>Christoper Berry</b> (Glasgow)</div>
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28-Apr <b>David Mulryne</b> (QMUL)</div>
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<b>Finally the full list can be found here:</b></div>
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<a style="margin: 0px;" data-auth="NotApplicable" data-linkindex="1" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" class="OWAAutoLink" id="OWA8da6b207-e6ee-749e-ba3a-6be87d2a2f9d" href="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx">https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx</a></div>
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Please let us know if you would like to chat with the speakers and we will arrange for that. </div>
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Best wishes,</div>
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Ed and Qi-Xin</div>
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