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Dear All,</div>
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<span style="line-height: 1.38;">We have a seminar this week, whose details are provided below - </span></div>
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<b>Speaker: </b> <b>Anish Ghoshal </b>(Warsaw)</div>
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<b>Seminar date:</b> <b>21st Apr, 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: Hearing the Universe Humm with Pulsar timing array: Gravitational Waves and Primordial Black Holes from First-order Phase Transition</b></div>
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<b>Abstract</b>: </div>
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We will discuss interpretation of the nHz stochastic gravitational wave background (SGWB) seen by NANOGrav and other Pulsar Timing Array (PTA) Collaborations in the context of supermassive black hole (SMBH) binaries. The frequency spectrum of this stochastic
background is predicted more precisely than its amplitude. We will discuss how Dark Matter friction can suppress the spectrum around nHz frequencies, where it is measured, allowing robust and significant bounds on the Dark Matter density, which, in turn, controls
indirect detection signals from galactic centers. Next we will discuss alternative cosmological interpretations including cosmic strings, phase transitions, domain walls, primordial fluctuations and axion-like physics. We will discuss how well these different
hypotheses fit the NANOGrav data, both in isolation and in combination with SMBH binaries, and address the questions: which interpretations fit the data best, and which are disfavoured. We also discuss experimental signatures that can help discriminate between
different sources of the PTA GW signals with complementary probes using CMB experiments and searches for light particles in DUNE, IceCUBE-Gen2, neutrinoless double beta decay, and forward physics facilities at the LHC like FASER nu, etc. and with Primordial
Black Hole formation and its constraints in the context to theories of dynamical electroweak symmetry breaking predict a strong first order cosmological phase transition. </div>
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based on</div>
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Refs: https://arxiv.org/abs/2306.17158, https://arxiv.org/abs/2307.02259, https://arxiv.org/abs/2401.09411,</div>
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https://arxiv.org/abs/2409.04545</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);"><a 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" target="_blank" id="OWAe481c872-db26-3e8e-63d7-e66b10fc57db" class="OWAAutoLink" 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" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="color: rgb(5, 99, 193); margin: 0px;"><u>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</u></a></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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28-Apr <b>David Mulryne</b> (QMUL)</div>
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5-May <b>Christopher McCabe</b> (KCL)</div>
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12-May <b>Katy Clough</b> (QMUL) Probing beyond GR and the Standard Model using gravitational waves</div>
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19-May <b>Graham White</b> (Southampton)</div>
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<b>Finally the full list can be found here:</b></div>
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<a href="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" target="_blank" id="OWA2664fafb-ea79-b0a1-97f5-25066af06efe" class="OWAAutoLink" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="1" style="margin: 0px;">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 speaker 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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