California State University Long Beach
Monday, November 27, 2017
11:15 am in PH1-223
(Refreshments served at 10:45am in HSCl-224)

A Curious Supergravity Story
Prof. Zvi Bern Physics & Astronomy Department University of California Los Angeles

For the past 35 years nearly all theoretical physicists have believed that all quantum gravity theories based on Einstein’s general relativity necessarily must be ill defined. This is the well-known nonrenormalizability problem of gravity. But is it actually true in general? We describe recent calculations that cast doubt on this simple picture and show that quantum gravity is much tamer than believed possible. The new calculations make use of enormous advances in our ability to compute scattering amplitudes in quantum field theory, including exploiting nontrivial “double copy” relations between gravity theories and gauge theories.