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SUMMARY:Third law of black hole mechanics for supersymmetric black holes -
  Harvey Reall\, DAMTP\, Cambridge
DTSTART:20250214T130000Z
DTEND:20250214T140000Z
UID:TALK225871@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:The third law of black hole mechanics asserts that it is impos
 sible for a non-extremal black hole to become extremal in finite time (in 
 classical General Relativity). A proof of this law was claimed in the 1980
 s. However\, counterexamples to this law were found recently: gravitationa
 l collapse of a massless charged scalar field can produce an exactly extre
 mal Reissner-Nordstrom black hole in finite time\, passing through an inte
 rmediate phase in which the solution is exactly Schwarzschild at the horiz
 on. These examples involve matter with a large charge to mass ratio. What 
 about theories\, such as supersymmetric theories\, with an upper bound on 
 the charge to mass ratio of matter? In this case I have proved that one ca
 nnot form a supersymmetric black hole (such as extremal Reissner-Nordstrom
 ) in finite time. Thus a third law holds for supersymmetric black holes. T
 he proof involves ideas related to quasi-local energy. In this talk I shal
 l review all of these developments.
LOCATION:Potter room/Zoom: https://cam-ac-uk.zoom.us/j/86544434784?pwd=dE3
 XiqwmaWGPz9w5pXNkKk93XsmtJv.1
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