QED loop effects in the spacetime background of a Schwarzschild black hole

TL;DR

This paper investigates quantum electrodynamics effects near a Schwarzschild black hole horizon, focusing on loop corrections to propagators caused by black-hole evaporation, revealing non-classical phenomena like negative energy density.

Contribution

It analyzes how black-hole evaporation modifies QED propagators and explores the resulting local effects near the horizon beyond tree-level approximations.

Findings

Loop effects induce non-trivial local modifications in QED near the horizon.

Black-hole evaporation leaves imprints detectable through quantum field corrections.

Region near the horizon exhibits negative energy density and flux, indicating non-classical behavior.

Abstract

The black-hole evaporation implies that the quantum-field propagators in a local Minkowski frame acquire a correction, which gives rise to this process. The modification of the propagators causes, in turn, non-trivial local effects due to the radiative/loop diagrams in non-linear QFTs. In particular, there should be imprints of the evaporation in QED, if one goes beyond the tree-level approximation. Of special interest in this respect is the region near the black-hole horizon, which, already at tree level, appears to show highly non-classical features, e.g., negative energy density and energy flux into the black hole.