[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: Parthasarathi Majumdar

[Swagat Mishra]

A Gentle reminder of today's seminar


Swagat Saurav Mishra,

Research Fellow

​

Particle Cosmology Group,

Centre for Astronomy and Particle Theory,

University of Nottingham, Nottingham NG7 2RD, UK.

Website: https://swagatam18.wordpress.com/

Research Link:https://inspirehep.net/authors/1517353

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Sent: 01 September 2025 08:00
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Subject: [Particles] [CAPT] Particle Cosmology and Gravity Seminar this week: Parthasarathi Majumdar

Dear All,

                  We have a seminar this week. The details are provided below -

-----------------------------------------

Speaker: Parthasarathi Majumdar

Seminar date: September 2nd , Tuesday, 1 pm UK time

Venue: Seminar Room A 113 (Cripps North Building, CAPT)


Title: Can Gravitational Wave Data Constrain Dark Matter Particles ?


Abstract: Gravitational wave (GW) data from observed binary black hole coalescences (BBHC), proven

to validate the Hawking Area Theorem (HAT) for black hole horizons, has been demonstrated
to unambiguously pick theoretically computed logarithmic corrections to the Bekenstein-Hawking
Area Formula, which have a negative coefficient, when combined with the Generalized Second Law of
thermodynamics. We propose a composite, ‘hybrid’ approach to quantum gravity black hole entropy
calculation, additively combining results from the non-perturbative, background-independent Loop
Quantum Gravity method, with those from the perturbative (one loop), background-dependent
semiclassical approach (often called ‘geometric’ entropy) based on Euclidean Quantum Gravity.
Our goal is to examine under what conditions, absolute consistency with HAT-validating GW data
analyses is guaranteed. As a consequence of this demand for absolute consistency, nontrivial, albeit
indirect constraints appear to emerge on the Beyond-Standard-Model (BSM) part of the spectrum
of perturbative elementary particle fluctuations in a classical black hole background. One of the
consequences of these constraints is the tension that co-existence of pseudoscalar axions and
spin 2 gravitons may have, with our requirement of absolute consistency with gravitational wave observations.


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Link to join:

 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


List of upcoming Seminars:

Sept 23rd: Andrey Shkerin (Canada)
Sept 30th: Adam Gammon-Smith (Nottingham)
Oct 7th: William Giarè (Sheffield)
Oct 14th: William Coulton (Cambridge)
Oct 21st: Fiona McCarthy (Cambridge)
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