Description
Speaker: Nava Gaddam
Abstract:
I will argue that there is an emergent infrared triangle near the horizon of a black hole, analogous to the one in flat space. In scalar QED in a Schwarzschild background, I will show that the Ward identities corresponding to near-horizon asymptotic symmetries match exactly with a new emergent leading soft photon theorem that can be derived in an effective field theory near the horizon. Finally, the soft factor is related to a near-horizon memory effect via a Fourier transform. I will argue that the story generalises to gravitational perturbations. I will conclude with speculations on the impact of these soft modes on the validity of effective field theory in quantum gravity.
