On resonances, amplitudes and the UV completion of gravity

by Rodrigo Alonso De Pablo (University of Tokyo (JP))

Thursday 1 Aug 2019, 13:15 → 14:15 Europe/Zurich

4/2-037 - TH meeting room (CERN)

We will construct, making use of the on-shell amplitude methods, a possible ultraviolet completion of gravity following a "bottom-up" approach. The assumptions of locality, unitarity and causality i) require an infinite tower of resonances with increasing spin and quantized mass, ii) introduce a duality relation among crossed scattering channels, and iii) dress all gravitational amplitudes in the Standard Model with a form factor that closely resembles either the Veneziano or the Virasoro-Shapiro amplitude in string theory. As a consequence of unitarity, the theory predicts leading order deviations from General Relativity in the coupling of gravity to fermions that can be explained if space-time has torsion in addition to curvature.