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SUMMARY:Observational evidence of cosmological coupling in black holes - K
 evin Croker\, University of Hawaii at Manoa
DTSTART:20231208T130000Z
DTEND:20231208T140000Z
UID:TALK209272@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:Over the past ten years\, observational evidence has continued
  to mount that astrophysical black holes grow too quickly or are more mass
 ive than easily explained by physical processes such as merger and accreti
 on. With the advent of gravitational wave astronomy\, this evidence now sp
 ans all observational channels\, over ten orders of magnitude in mass\, an
 d over cosmological timescales. The simplest black hole model\, Kerr\, can
 not be applied over cosmological timescales because it has non-cosmologica
 l boundary conditions. Aspects of non-singular and horizon-free black hole
  models in General Relativity suggest dynamics on cosmological timescales 
 that can help to ease these observational tensions. We review recent forma
 l advances in General Relativity that permit investigation of candidate bl
 ack hole models through their possible cosmological interactions\, and pre
 sent the first observational evidence for cosmologically coupled mass grow
 th in the supermassive black holes of quiescent elliptical galaxies. The m
 easured growth is consistent with a vacuum energy equation of state for as
 trophysical black hole contributions in aggregate\, leading to the strikin
 g prediction that astrophysical black holes may well be the material sourc
 e that drives accelerated late-time expansion.
LOCATION:Potter room/Zoom
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