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Events on Friday, December 18th, 2020

Academic Calendar
Summary period (exams)
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Theory Seminar (High Energy/Cosmology)
Observations of Hawking radiation: the Page curve and baby universes
Time: 2:00 pm
Place: For zoom link, sign up at:
Speaker: Henry Maxfield, University of California, Santa Barbara
Abstract: I'll discuss recent progress in black hole information, using 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 will formulate this in terms of an operationally-defined notion of entropy, using a Lorentz-signature gravitational path integral in asymptotically flat spacetimes. I'll then explain the Hilbert space interpretation of these calculations, which requires the introduction of a Hilbert space of baby universes, and results in superselection sectors for asymptotic observers.
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Department Coffee Hour
Time: 3:30 pm
Place:
Abstract: Join us weekly for an informal virtual coffee hour! Catch up with others in the department, tell us how things are going, and impress everyone with your Zoom background skills. Coffee Hour is open to any and all faculty, staff, and students in the department. Sometimes we have a topic, and we'll try to get that topic posted here in advance or sent out by email before each coffee hour.
Host: Department
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Academic Calendar
Graduate School Fall 2020: Master&#39;s degree deadline
Time: 4:00 pm
Place:
Abstract: Degree candidates must complete all steps: CONTACT: 262-2433, gsacserv@grad.wisc.edu URL:
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