Schedule Apr 07, 2022
Causality constraints on corrections to Einstein gravity
Julio Parra-Martinez, Caltech
Cite as: doi:10.26081/K6B334

In this talk I will describe constraints from causality and unitarity on 2ā†’2 graviton scattering in four-dimensional weakly-coupled effective field theories. Together, causality and unitarity imply dispersion relations that connect low-energy observables to high-energy data. Using such dispersion relations, I will explain how to derive two-sided bounds on gravitational Wilson coefficients in terms of the mass M of new higher-spin states. Such 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. Time permitting, I will comment on the experimental implications of the bounds.

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