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<span style="font-size: 10pt; color: rgb(68, 68, 68); line-height: normal;"><b>Swagat Saurav Mishra</b></span><span style="font-size: 10pt; line-height: normal;">,</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Particles <particles-bounces@lists.nottingham.ac.uk> on behalf of Elisa Todarello <Elisa.Todarello@nottingham.ac.uk><br>
<b>Sent:</b> 01 September 2025 08:00<br>
<b>To:</b> capt@nottingham.ac.uk <capt@nottingham.ac.uk>; maths-quantum-gravity-group@lists.nottingham.ac.uk <maths-quantum-gravity-group@lists.nottingham.ac.uk>; O365-Gravity Laboratory <o365-gravitylaboratory@UniofNottm.onmicrosoft.com>; ncog-people@nottingham.ac.uk
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<b>Cc:</b> Bobby Acharya <bacharya@ictp.it>; Ella Batchelor (staff) <ppzeb1@exmail.nottingham.ac.uk>; Drande Patogu <ppydp10@exmail.nottingham.ac.uk>; Leonora van Deurs <ppylv1@exmail.nottingham.ac.uk>; Jacob Thornley <ppyjt15@exmail.nottingham.ac.uk>; bhpartha@gmail.com
<bhpartha@gmail.com><br>
<b>Subject:</b> [Particles] [CAPT] Particle Cosmology and Gravity Seminar this week: Parthasarathi Majumdar</font>
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Dear All,</div>
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We have a seminar this week. The details are provided below - </div>
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<span style="font-size:15px"><b>Speaker:</b> </span><span style="font-size:11pt"><b>Parthasarathi Majumdar </b></span></div>
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<b>Seminar date:</b> September 2nd <b>, Tuesday, 1 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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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black"><b>Title:
</b></span><span style="font-family:"Segoe UI","Segoe UI Web (West European)",-apple-system,"system-ui",Roboto,"Helvetica Neue",sans-serif; font-size:15px; color:black"><b><i>Can Gravitational Wave Data Constrain Dark Matter Particles ?</i></b></span></p>
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<span style="font-family:"Segoe UI","Segoe UI Web (West European)",-apple-system,"system-ui",Roboto,"Helvetica Neue",sans-serif; font-size:15px; color:black"><b>Abstract:
</b></span><span style="font-family:"Segoe UI","Segoe UI Web (West European)",-apple-system,"system-ui",Roboto,"Helvetica Neue",sans-serif; font-size:15px; color:rgb(36,36,36)">Gravitational wave (GW) data from observed binary black hole coalescences (BBHC),
proven</span></p>
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to validate the Hawking Area Theorem (HAT) for black hole horizons, has been demonstrated<br>
to unambiguously pick theoretically computed logarithmic corrections to the Bekenstein-Hawking<br>
Area Formula, which have a negative coefficient, when combined with the Generalized Second Law of<br>
thermodynamics. We propose a composite, ‘hybrid’ approach to quantum gravity black hole entropy<br>
calculation, additively combining results from the non-perturbative, background-independent Loop<br>
Quantum Gravity method, with those from the perturbative (one loop), background-dependent<br>
semiclassical approach (often called ‘geometric’ entropy) based on Euclidean Quantum Gravity.<br>
Our goal is to examine under what conditions, absolute consistency with HAT-validating GW data<br>
analyses is guaranteed. As a consequence of this demand for absolute consistency, nontrivial, albeit<br>
indirect constraints appear to emerge on the Beyond-Standard-Model (BSM) part of the spectrum<br>
of perturbative elementary particle fluctuations in a classical black hole background. One of the </div>
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consequences of these constraints is the tension that co-existence of pseudoscalar axions and </div>
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spin 2 gravitons may have, with our requirement of absolute consistency with gravitational wave observations. </div>
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<b>Link to join:</b></div>
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<b><i><u>List of upcoming Seminars:</u></i></b></div>
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<b><i><u><br>
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Sept 23rd: Andrey Shkerin (Canada)</div>
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Sept 30th: Adam Gammon-Smith (Nottingham)</div>
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Oct 7th: William Giarè (Sheffield)</div>
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Oct 14th: William Coulton (Cambridge)</div>
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Oct 21st: Fiona McCarthy (Cambridge)</div>
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