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SUMMARY:Black Hole from Entropy Maximization
DTSTART;VALUE=DATE-TIME:20241008T000000Z
DTEND;VALUE=DATE-TIME:20241008T013000Z
DTSTAMP;VALUE=DATE-TIME:20241003T223724Z
UID:indico-event-173@indico.nitep.omu.ac.jp
DESCRIPTION:Date: October 8 (Tue)\, 9:00(JST)\nSpeaker: Yuki Yokokura (RIK
EN)\nTitle: Black Hole from Entropy Maximization\n\nAbstract: The identity
of a black hole is still mysterious theoretically and observationally. It
has the thermodynamic entropy (the Bekenstein-Hawking entropy). According
to quantum theory and thermodynamics\, the origin of thermodynamic entrop
y is quantum mechanical. Therefore\, a black hole should be essentially a
quantum object. So\, what is the quantum definition/characterization of bl
ack holes? One candidate motivated by (local) holography and thermodynamic
s is that a black hole maximizes thermodynamic entropy for a given (expect
ation value of) surface area. As a step toward exploring this possibility\
, we study the entropy of various highly-excited spherical static configur
ations in the 4D semi-classical Einstein equation with many matter fields\
, and reach uniquely the entropy-maximizing configuration. That is\, self-
gravitating quanta condensate into a radially-uniform dense configuration
with no horizon\, where the self-gravity and a large quantum pressure indu
ced by the curvatures are balanced and no singularity appears. The interio
r metric is a self-consistent and non-perturbative solution for Planck's c
onstant. The maximum entropy\, given by the volume integral of the entropy
density\, agrees exactly with the Bekenstein-Hawking formula through the
self-gravity\, leading to the Bousso bound for thermodynamic entropy. Fina
lly\, we see a speculative view that the configuration represents semi-cla
ssically a quantum-gravitational condensate. [arXiv:2309.00602]\n\nhttps:/
/indico.nitep.osaka-cu.ac.jp/event/173/
LOCATION:
URL:https://indico.nitep.osaka-cu.ac.jp/event/173/
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