Causality Constraints on Gravitational Effective Field Theories

Explore a High Energy Physics seminar where Caltech's Julio Parra-Martinez delves into the fundamental constraints of causality and unitarity on graviton scattering in gravitational effective field theories. Learn how dispersion relations connect low-energy observables to high-energy data, leading to important bounds on gravitational Wilson coefficients relative to higher-spin state masses. Discover key insights about gravitational interactions, including their uniform shutdown as G approaches zero, the confirmation of dimensional analysis scaling expectations, and the necessity of weak coupling below Planck scale. Examine the implications for gravitational EFTs with numerous light fields and understand why they must maintain a low cutoff.