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Friday, November 1, 2019 at 1:00pm
Physical Sciences Building, 401
245 East Avenue
Weak Gravity Conjecture from Amplitudes’ Positivity
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.