[phys4phys] Group for Gravitation, Particle and Fields on-line seminar, Friday 19 November 2021

[Marija Dimitrijevic Ciric]

Dear colleagues,

You are cordially invited to the online seminar of the Group for 
Gravitation, Particles and Fields, which will be held (note the unusual 
time) on Friday, 19 November 2021 at 12:00 via the BigBlueButton 
platform (link is given below).


The talk entitled

Black hole entropy and the information loss paradox

will be given by Voja Radovanovic (Faculty of Physics, University of 
Belgrade).

Abstract: The most important unsolved problem in black hole physics is 
the information loss paradox, i.e. whether the process of formation and 
evaporation of a black hole is unitary in accordance with quantum 
mechanics. The unitarity implies that von Neumann entropy of the Hawking 
radiation should initially increase but subsequently fall back down, 
following the so-called Page curve.

In the first talk of this series we consider black hole thermodynamics 
and discuss various concepts of entropy: fine-grained, coarse-grained 
and entanglement entropy. In addition, we calculate entanglement entropy 
for Rindler observer and show how to generalize this result to curved 
space-time, where it is used to define generalized entropy of a black 
hole.

The upcoming talks will be devoted to the so-called wormhole replica 
trick and the notion of an island - a kind of a quantum extremal surface 
recently advocated by Maldacena. We study a particular case of 2D 
dilaton gravity obtained by dimensional reduction of the 
Einstein-Hilbert action for Schwarzschild metric. We calculate the von 
Neumann entropy of the Hawking radiation and reproduce the Page curve.


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Time: November 19, 2021 12:00 Belgrade

https://gravityserver.ipb.ac.rs/b/mar-xoo-t1v-vwn

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Best regards,

Marija Dimitrijevic Ciric

University of Belgrade
Faculty of Physics
Studentski trg 12-16
11000 Belgrade
Serbia