Small black/white hole stability and dark matter

TL;DR

This paper proposes that small black hole remnants, stabilized by quantum effects from Loop Quantum Gravity, could constitute a component of dark matter, with their lifetime and stability consistent with cosmological conditions.

Contribution

It introduces a quantum model for white hole remnants, showing their stability and potential role as dark matter candidates, based on Loop Quantum Gravity predictions.

Findings

White hole remnants have lifetimes compatible with cosmological reheating.

Quantum superpositions of black and white holes are stable due to minimal area eigenvalues.

Small black hole remnants could form a component of dark matter.

Abstract

We show that the expected lifetime of white holes formed as remnants of evaporated black holes is consistent with their production at reheating. We give a simple quantum description of these objects and argue that a quantum superposition of black and white holes with large interiors is stable, because it is protected by the existence of a minimal eigenvalue of the area, predicted by Loop Quantum Gravity. These two results support the hypothesis that a component of dark matter could be formed by small black hole remnants.