Speaker
Tom Hartman
Description
A natural metric on four-dimensional QFTs was introduced by Jack and Osborn in their work on the local renormalization group. This metric determines the flow of the a-anomaly and is closely tied to the a-theorem, but it is not manifestly positive. In this talk I will show that the Jack-Osborn metric is related to the ANEC operator, and discuss more broadly the connections among three different probes of RG flows: dilaton scattering amplitudes, light-ray sum rules, and perturbative RG.