Causality Constraints on Gravitational Effective Theories

par Prof. Julio Parra-Martinez (Caltech)

mardi 17 mai 2022, 16:00 → 17:00 Europe/Paris

Salle de conférences du Bâtiment Alix et Marwan Lahoud (IHES)

In this talk I will describe constraints from causality and unitarity on 2→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, 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 G→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.

Sujet : Quantum Encounter Seminar
Heure : 17 mai 2022 04:00 PM Paris

Participer à la réunion Zoom
https://us02web.zoom.us/j/85890403645?pwd=_WMK9e4w_JBbmNZFpTsnd4zUMmjnSa.1

ID de réunion : 858 9040 3645
Code secret : 301826

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