Events Daily

Wednesday, January 25, 2023

HEP Journal Club
Event Type: Other
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

Causality constraints on gravitational effective theories
Julio Parra-Martinez, Caltech
Event Type: HEP Seminar
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: I will describe constraints from causality and unitarity on 2ā†’2 graviton scattering in weakly-coupled gravitational effective field theories. Together, causality and unitarity imply dispersion relations that connect low-energy observables to high-energy data. Using such dispersion relations, we can derive two-sided bounds on gravitational Wilson coefficients in terms of the mass M of new higher-spin states. Our bounds imply that gravitational interactions must shut off uniformly in the limit Gā†’0, and prove the scaling with M expected from dimensional analysis. In addition they demonstrate the gravity must be weakly coupled at all scales below Planck and that gravitational EFTs with a large number of light fields must have a low cutoff.

Link to the Event Video