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SUMMARY:Randomness and the Emergence of Spacetime
DTSTART:20260415T053000Z
DTEND:20260415T073000Z
DTSTAMP:20260504T033800Z
UID:indico-event-9323@scitalks.tifr.res.in
DESCRIPTION:Speakers: Pratik Rath (TIFR\, Mumbai)\n\nWhy does spacetime ad
 mit a simple semiclassical description\, and what role does randomness pla
 y in its emergence from quantum mechanics? In this talk\, I will argue tha
 t randomness plays a crucial role in several recent advances in quantum gr
 avity\, while also leading to some of its sharpest open puzzles. I will be
 gin with random tensor networks\, which serve as tractable models of the A
 dS/CFT dictionary. I will explain how these models can be related quantita
 tively to the gravitational path integral through fixed-area states\, allo
 wing tensor network calculations to illuminate the entanglement structure 
 of gravitational systems. I will also discuss Jackiw–Teitelboim gravity 
 and the PSSY model of black hole evaporation\, where randomness appears th
 rough ensemble averaging and replica wormholes\, leading to a semiclassica
 l computation of the Page curve. Taken together\, these examples suggest t
 hat coarse-graining and randomness are deeply tied to the emergence of spa
 cetime. At the same time\, they raise a basic question: how can such a pic
 ture be reconciled with exact factorization in holography? I will conclude
  by discussing this tension and its relation to recent puzzles involving c
 losed universes\, which may offer a useful window into the limits of our c
 urrent understanding of emergent spacetime.\n\nhttps://scitalks.tifr.res.i
 n/event/9323/
LOCATION:A304 and zoom
URL:https://scitalks.tifr.res.in/event/9323/
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