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SUMMARY:No-Horizon Physics on the Horizon? Phenomenology of Black Hole Mic
 rostates - Paolo Pani - Sapienza University of Rome
DTSTART:20231129T140000Z
DTEND:20231129T150000Z
UID:TALK208348@talks.cam.ac.uk
CONTACT:Amanda Stagg
DESCRIPTION:Once considered bizarre solutions to Einstein's General Relati
 vity\, black holes have now acquired a central role in astrophysics\, cosm
 ology\, particle and theoretical physics. Their physics connects gravity\,
  thermodynamics and quantum mechanics\, and the paradoxes they reveal are 
 deep and far-reaching: their Hawking evaporation is incompatible with quan
 tum unitarity\, the microstates underlying their enormous entropy are unkn
 own\, and they conceal singularities where Einstein's theory breaks down. 
 One possibility\, supported both by Quantum-Information-Theory arguments a
 nd by explicit String Theory constructions\, is that these paradoxes are r
 esolved by the existence of new horizon-scale physics. Gravitational-wave 
 observations provide us with unprecedented probes of the nature of dark co
 mpact objects at the scale of the horizon. I will give an overview of the 
 many recent results in this area (including ringdown tests\, multipole mom
 ents\, and tidal effects in binaries) and discuss the outstanding challeng
 es ahead. These tests are to a large extent model agnostic\, but tailored 
 to and motivated by the string-theory fuzzball scenario.
LOCATION:MR2
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