Dynamics of apparent horizons in quantum gravitational collapse

TL;DR

This paper investigates how loop quantum gravity modifies the collapse of a scalar field, preventing singularities and predicting a threshold scale below which horizons do not form, leading to a quantum bounce.

Contribution

It introduces a model showing quantum gravity effects prevent horizon formation below a certain scale during collapse.

Findings

Classical singularity is replaced by a quantum bounce.

A threshold scale exists below which no horizon forms.

Quantum effects modify collapse dynamics significantly.

Abstract

We study the gravitational collapse of a massless scalar field within the effective scenario of loop quantum gravity. Classical singularity is avoided and replaced by a quantum bounce in this model. It is shown that, quantum gravity effects predict a threshold scale below which no horizon can form as the collapse evolves towards the bounce.