Quantum Radiation from Quantum Gravitational Collapse

TL;DR

This paper investigates quantum radiation emitted during the gravitational collapse of a quantized spherical domain wall, revealing non-thermal radiation and evaporation effects influenced by the wavefunction of the collapsing matter.

Contribution

It introduces a quantum model of gravitational collapse that accounts for the wavefunction of the collapsing object and analyzes the resulting radiation, extending previous semiclassical results.

Findings

Quantum radiation depends on the wavefunction of the collapsing wall.

Radiation emitted is non-thermal and correlates with collapse dynamics.

Results align with earlier semiclassical analyses.

Abstract

We study quantum radiation emitted during the collapse of a quantized, gravitating, spherical domain wall. The amount of radiation emitted during collapse now depends on the wavefunction of the collapsing wall and the background spacetime. If the wavefunction is initially in the form of a sharp wavepacket, the expectation value of the particle occupation number is determined as a function of time and frequency. The results are in good agreement with our earlier semiclassical analysis and show that the quantum radiation is non-thermal and evaporation accompanies gravitational collapse.