Pratik Rath (TIFR): Closed Universes vs AdS/CFT - Lecture 4
Автор: TIFR Quantum Space-Time Seminars
Загружено: 2026-02-18
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Date: 2026-02-18
In these lectures, I will focus on a puzzle pointed out in arXiv:2408.02720 (with Antonini) that highlights ambiguities in the AdS/CFT dictionary in the presence of closed universes. I will discuss various constructions of closed universes in AdS/CFT and explain the general formalism laid out by Marolf-Maxfield to understand the Hilbert space of closed universes. The tension in
the puzzle is closely related to the presence of a one-dimensional Hilbert space in the absence of ensemble averaging in the CFT. I will explain how the same physics appears in the black hole information paradox and entanglement islands that explain the Page curve of black hole evaporation. Finally, I will discuss various ideas in the literature that try to resolve this puzzle.
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