[phys4phys] Seminar by Roberto Emparan, Wednesday, 31 July, 3pm

[Mihailo Čubrović]

Dear colleagues,

You are cordially invited to the seminar by Roberto Emparan, on 
Wednesday, 31 July 2024 at 3pm in the Zvonko Marić lecture hall at the 
Institute of Physics Belgrade. Roberto is an excellent lecturer and I 
particularly recommend the lecture to PhD students (it will start with a 
gentle introduction). Title and abstract follow.

Title: Black hole microstates

Abstract: Identifying a set of microstates for a black hole in a regime 
of strong gravitational coupling is necessary to understand the nature 
of the black hole interior, the singularity, the experience of the 
infalling observers, and other problems. Black holes can harbor 
arbitrarily large interiors in the form of "bag-of-gold geometries", 
which have the desirable property of providing good microstates, but the 
bad feature of yielding too many of them, even infinite. I will describe 
how the gravitational path integral allows the construction of an 
extremely universal class of microstates (neutral or charged, with 
rotation, extremal or not, and in any number of dimensions), and argue 
that spacetime wormholes reduce the dimension of the space of these 
states to a value in agreement with the Bekenstein-Hawking formula.

-- 
Dr. Mihailo Čubrović

Center for the Study of Complex Systems
Institute of Physics Belgrade
National Institute of the Republic of Serbia
Pregrevica 118, 11080 Belgrade, Serbia
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