Add to Calendar

When:

November 24, 2020 @ 4:00 pm – 5:00 pm

2020-11-24T16:00:00+02:00

2020-11-24T17:00:00+02:00

Title: Gravity from Averaging CFTs

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.