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Theory Seminar (High Energy/Cosmology)

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Two topics in quantum gravity
Date: Friday, November 13th
Time: 2:00 pm
Place: For zoom link, sign up at: https://groups.google.com/a/g-groups.wisc.edu/d/forum/theoryseminars/join
Speaker: Oliver Janssen, ICTP, Trieste
Abstract: I will discuss two topics in quantum gravity, both involving the gravitational path integral. In the first part I will introduce the “no-boundary wave function”, a path integral over geometries on compact four-manifolds which solves the Wheeler-DeWitt equation. I will then outline how this object can be computed, and comment on its interpretation, in the scenario of minimally coupled scalar field matter subject to a potential energy function of the slow-roll type. In the second part I will comment on a proposal which identifies bulk gravitational path integrals with ensemble averages of boundary partition functions. This talk is based on 2009.06282 and work in progress.
Host: Lars Aalsma
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