[institut] [phys4phys] 11:00 SHARP, Group for Gravitation, Particles and Fields seminar, Friday, 15th of May, 2026

[Igor Prlina]

Dear colleagues,

You are cordially invited to the seminar of the Group for Gravitation, 
Particles and Fields, which will be held on Friday, 15th of May, 2026, 
at 11:00 at the Institute of Physics Belgrade, lecture hall 360. PLEASE 
NOTE THAT THE SEMINAR WILL START EXACTLY AT 11:00, so that we have time 
to join the celebration of the Day of the Institute.

The talk entitled:

The Structure of Cauchy Surfaces for an Evaporating Black Hole and the 
Information Loss Paradox

will be given by Stefan Katić (Institute of Physics Belgrade).

Abstract: In this talk, we analyze the causal structure of an 
evaporating black hole space-time and its connection to the black hole 
information loss paradox. Namely, we elaborate Tim Maudlin's idea that 
the inclusion of the evaporation event into the space-time yields 
disconnected Cauchy surfaces. We do this by analyzing important theorems 
concerning Cauchy surfaces and global hyperbolicity, and their 
application to the evaporating black hole space-time. We will make a 
distinction between two types of evaporating black hole space-times, 
depending on whether the evaporation event is included or not, and we 
will see that some of those theorems don't apply to one of these them. 
We won't give a mathematically rigorous proof, but we will state a 
theorem which suggests a mathematical legitimacy of Maudlin's idea. 
After that, we will comment briefly on the entanglement entropy of 
disconnected Cauchy surfaces.

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Time: May 15, 2026 11:00 Belgrade

Institute of Physics Belgrade, lecture hall 360, 2nd floor

BigBlueButton platform link: 
https://gravityserver.ipb.ac.rs/b/mar-ae0-f4q-qww

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Best regards,
Igor Prlina
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