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UID:UW-Physics-Event-6221
DTSTART:20210129T200000Z
DTEND:20210129T210000Z
DTSTAMP:20260415T003604Z
LAST-MODIFIED:20210125T194235Z
LOCATION:For zoom link\, sign up at: https://groups.google.com/a/g-gro
 ups.wisc.edu/d/forum/theoryseminars/join
SUMMARY:A physical protocol to obtain information in quantum gravity\,
  Theory Seminar (High Energy/Cosmology)\, Chandramouli Chowdhury\, ICT
 S\, Bangalore
DESCRIPTION:We consider a set of observers who live near the boundary 
 of global AdS\, and are allowed to act only with simple low-energy uni
 taries and make measurements in a small interval of time. The observer
 s are not allowed to leave the near-boundary region. We describe a phy
 sical protocol that nevertheless allows these observers to obtain deta
 iled information about the bulk state. This protocol utilizes the lead
 ing gravitational back-reaction of a bulk excitation on the metric\, a
 nd also relies on the entanglement-structure of the vacuum. For low-en
 ergy states\, we show how the near-boundary observers can use this pro
 tocol to completely identify the bulk state. We explain why the protoc
 ol fails completely in theories without gravity\, including non-gravit
 ational gauge theories. This provides perturbative evidence for the cl
 aim that one of the signatures of holography -- the fact that informat
 ion about the bulk is also available near the boundary -- is already v
 isible in semiclassical gravity. This is work done in collaboration wi
 th Olga Papadoulaki and Suvrat Raju\, in 2008.01740.
URL:https://www.physics.wisc.edu/events/?id=6221
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