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SUMMARY:Victor Gorbenko (Stanford)
DTSTART:20210601T100000Z
DTEND:20210601T110000Z
DTSTAMP:20260513T213956Z
UID:CCTP_HEP/51
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CCTP_HEP/51/
 ">Bra-ket wormholes in gravitationally prepared states</a>\nby Victor Gorb
 enko (Stanford) as part of CCTP HEP Seminars\n\n\nAbstract\nWe will discus
 s two-dimensional toy-models of inflation in which the state of the univer
 se is prepared by a gravitational path integral. As a first model\, we con
 sider a state produced by Euclidean AdS_2 evolution followed by flat space
  evolution. We use the fine grained entropy formula to explore the nature 
 of the state. We find that the naive hyperbolic space geometry (analog of 
 the Hartle-Hawking state) leads to a paradox. This is solved if we include
  a geometry that connects the bra with the ket\, a bra-ket wormhole. The s
 emiclassical Lorentzian interpretation leads to CFT state entangled with a
 n expanding and collapsing Friedmann cosmology. I will then describe a sim
 ilar model where the state is prepared by the dS_2 evolution and highlight
  related puzzles.\n
LOCATION:https://researchseminars.org/talk/CCTP_HEP/51/
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