Trans-Planckian Modes, Back-Reaction, and the Hawking Process

TL;DR

This paper argues that quantum backreaction effects prevent Hawking radiation from occurring, challenging the traditional view of black-hole evaporation at trans-Planckian energies.

Contribution

It introduces a thought experiment showing that quantum backreaction inhibits Hawking radiation, suggesting black holes may not radiate as previously thought.

Findings

Quantum backreaction suppresses Hawking radiation

Black holes may not evaporate via Hawking process

Traditional predictions rely on physics beyond Planck scale

Abstract

Hawking's prediction of black-hole evaporation depends on the application of known physics to fantastically high energies -- well beyond the Planck scale. Here, I show that before these extreme regimes are reached, another physical effect will intervene: the quantum backreaction on the collapsing matter and its effect on the geometry through which the quantum fields propagate. These effects are estimated by a simple thought experiment. When this is done, it appears that there are no matrix elements allowing the emission of Hawking quanta: black holes do not radiate.