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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6205
DTSTART:20201218T200000Z
DTEND:20201218T210000Z
DTSTAMP:20210615T092840Z
LAST-MODIFIED:20201217T190747Z
LOCATION:For zoom link\, sign up at: https://groups.google.com/a/g-gro
ups.wisc.edu/d/forum/theoryseminars/join
SUMMARY:Observations of Hawking radiation: the Page curve and baby uni
verses\, Theory Seminar (High Energy/Cosmology)\, Henry Maxfield\, Uni
versity of California\, Santa Barbara
DESCRIPTION:I'll discuss recent progress in black hole information\, u
sing semiclassical gravity to compute the entropy of Hawking radiation
and finding the "Page curve" associated with a unitary quantum system
with density of states given by the Bekenstein-Hawking formula. I wil
l formulate this in terms of an operationally-defined notion of entrop
y\, using a Lorentz-signature gravitational path integral in asymptoti
cally flat spacetimes. I'll then explain the Hilbert space interpretat
ion of these calculations\, which requires the introduction of a Hilbe
rt space of baby universes\, and results in superselection sectors for
asymptotic observers.
URL:https://www.physics.wisc.edu/events/?id=6205
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