Quantum Oppenheimer-Snyder black hole evaporation and its fate

TL;DR

This paper explores quantum effects on black hole evaporation in a semiclassical framework, revealing conditions under which black hole remnants form or evaporate completely, influenced by quantum gravity and coupling constants.

Contribution

It introduces a detailed analysis of quantum Oppenheimer-Snyder black hole evaporation, highlighting the impact of loop quantum gravity effects and scalar field coupling on the black hole's fate.

Findings

Loop quantum gravity effects cause late-stage evaporation to slow and form remnants.

Remnant stability is confirmed by quasi-normal mode analysis.

Black hole fate depends on the scalar coupling constant 

Abstract

In this paper, we investigate the evaporation of the quantum Oppenheimer-Snyder black hole. Within a semiclassical framework, we compute the energy emission of Hawking radiation by introducing a massless scalar field as a test field, considering both minimally and non-minimally coupled cases. For the minimally coupled case, we find that loop quantum gravity effects become crucial at the late stage of the evaporation process, causing the emission rate to slow down and eventually terminate, leading to the formation of a black hole remnant. A quasi-normal mode analysis indicates the stability of this remnant. For the non-minimally coupled case, we show that the fate of the black hole strongly depends on the value of the coupling constant $\xi$. Focusing on the cases $\xi=\pm1$, we find that for $\xi=1$, the energy emission rate accelerates at late times and no remnant is formed, whereas for $\xi=-1$, the emission rate slows down and eventually terminates, resulting in a stable black hole remnant, as supported by the corresponding quasi-normal mode analysis.