Late-time correlators in semiclassical particle-black hole scattering

TL;DR

This paper investigates quantum effects in extremal black hole scattering, revealing that late-time correlators outside the horizon are significantly enhanced, which may imply a unitary description of Hawking radiation.

Contribution

It introduces a quantum-corrected geometric framework showing how late-time correlators differ from thermal predictions, suggesting potential unitarity in black hole radiation.

Findings

Correlators inside the horizon match vacuum correlators.

Late-time correlators outside the horizon are much larger than thermal predictions.

Quantum corrections may reconcile Hawking radiation with unitarity.

Abstract

We analyse the quantum corrected geometry and radiation in the scattering of extremal black holes by low-energy neutral matter. We point out the fact that the correlators of local observables inside the horizon are the same as those of the vacuum. Outside the horizon the correlators at late times are much bigger than those of the (thermal) case obtained neglecting the backreaction. This suggests that the corrected Hawking radiation could be compatible with unitarity.