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SUMMARY:A Local Wheeler-DeWitt Measure for the String Landscape - Arthur H
 ebecker - University of Heidelberg
DTSTART:20221031T130000Z
DTEND:20221031T140000Z
UID:TALK183233@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:According to the `Cosmological Central Dogma'\, de Sitter spac
 e can be viewed as a quantum mechanical system with a finite number of deg
 rees of freedom\, set by the horizon area. I will discuss how this assumpt
 ion\, together with the Wheeler-DeWitt (WDW) equation\, can be used to app
 roach the measure problem of eternal inflation. It turns out that one is s
 earching for a time-independent wave function of the universe on a total H
 ilbert space defined as the direct sum of a variety of subspaces: A finite
 -dimensional subspace for each de Sitter vacuum and an infinite-dimensiona
 l subspace for each terminal Minkowski or AdS vaccuum. I will argue that\,
  to be consistent with semiclassical intuition\, such a solution requires 
 the presence of sources. These are implemented as an inhomogenous term in 
 the WDW equation\, induced by the Hartle-Hawking no-boundary or the Linde/
 Vilenkin tunneling proposal. Taken together\, these steps unambiguously le
 ad to what we would like to think of as a `Local WDW measure\,' where `loc
 al' refers to the fact that the dS part of the resulting wave function des
 cribes a superposition of static patches. The global multiverse geometry m
 akes no explicit appearance.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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