19 Jun/19
11:30 - 13:30 (Europe/Zurich)

Amplitudes’ Positivity, Weak Gravity Conjecture, and Modified Gravity


4/2-011 at CERN

We derive new positivity bounds for scattering amplitudes in theories with a massless graviton in the spectrum in four spacetime dimensions, of relevance for the weak gravity conjecture and modified gravity theories.  The bounds imply that extremal black holes are self-repulsive, M/|Q| < 1 in suitable units, and that they are unstable to decay to smaller extremal black holes, providing an S-matrix proof of the weak gravity conjecture. We also present other applications of our bounds to the effective field theory of axions, P(X) theories, weakly broken galileons, and curved spacetimes.