Speaker: Javi Serra
Title: Weak Gravity Conjecture from Amplitudes’ Positivity
Host: John Terning
Room: 432
Abstract: In this talk I will show how to derive positivity bounds for scattering amplitudes in theories with a massless graviton in the spectrum in four spacetime dimensions. These new bounds imply that extremal black holes are self-repulsive, M/|Q|<1, once higher-dimensional operators beyond Einstein-Maxwell are taken into account, thus providing an S-matrix proof of the weak gravity conjecture. I will also present applications of these bounds to other gravitational theories, and discuss some future directions of investigation.
