Starts 15 Sep 2020 15:30
Ends 15 Sep 2020 17:00
Central European Time
Zoom Meeting
Please note unusual time!!!



Please register in advance for this meeting:

https://zoom.us/meeting/register/tJ0pcu6srTMiGtCT0p-vgstETyj_nF5m-UuB

After registering, you will receive a confirmation email containing information about joining the meeting.
Abstract. I will explore the idea that certain theories of gravity in Anti-de Sitter space are dual to an average over an ensemble of quantum theories, rather than to a specific quantum theory. I will describe an average over Narain’s family of two-dimensional conformal field theories which describe free bosons on a torus, and compute the partition function using the Siegel-Weil formula. The result takes the form of a sum over geometries as one would expect in a theory of gravity. But the gravitational theory looks more like a Chern-Simons theory than like Einstein gravity.