Program

13:30 Tea & Coffee
14:00 Thomas Hertog (Leuven) - Much Ado About Nothing
15:15 Coffee break
15:45 Andrew Rolph (UvA) - Island Mirages
17:00 Borrel (drinks and snacks)

Abstracts

Thomas Hertog (Leuven) 
Much Ado About Nothing

Abstract: I adopt a “wave function perspective” on Euclidean AdS/CFT to relate the entropy of Leiden hero Willem de Sitter to the partition function of a dual QFT on the three-sphere. I then exploit this relation to compute the leading and subleading quantum corrections to the de Sitter entropy. The microscopic roots provided by the dual clarify what the de Sitter entropy is and isn’t. Finally I comment on the extension of this framework to compute more tangible cosmological observables. 

Andrew Rolph (UvA) 
Island Mirages

Abstract: Islands are an important step in resolving the black hole information paradox. In this talk, I will firstly discuss and give resolutions to two new puzzles associated with islands and so-called island detectors. The puzzles are (1) a direct tension with the quantum Bousso bound and (2) an application of the quantum focussing conjecture which leads to a false conclusion about vacuum states. I will argue that the quantum Bousso bound is indeed violated for some evaporating black holes. Lastly, I will point out a loophole in the Island Finder paper (ArXiv:2101.11648), which connects to the puzzles through a similar violation of the quantum Bousso bound. The loophole opens the possibility of false detection of non-existent islands - island mirages.

Location

Special Location: Gravesteen Building, Pieterskerkhof 6, Leiden.

About

This event is part of a regular series of meetings sponsored by Delta ITP with the objective of bringing together the theoretical physics communities in Amsterdam, Leiden, Utrecht and our sister nodes Groningen, Brussels (ULB and VUB) and Leuven. The topic of this meeting is holography and its applications to different physical systems. We encourage researchers from different areas in theoretical physics to participate!

Organisers

Diego Hofman Uv Amsterdam
Umut Gursoy Utrecht Un.
Koenraad Schalm Leiden Un.