Hawking radiation of nonsingular black holes in two dimensions

TL;DR

This paper investigates Hawking radiation in nonsingular two-dimensional black holes modeled with a limiting curvature, revealing they radiate eternally and could serve as dark matter candidates.

Contribution

It introduces a two-dimensional dilaton gravity model with a limiting curvature, showing black holes that do not fully evaporate and remain as relics.

Findings

Black holes radiate eternally without complete evaporation.

The final state is a stable, eternally radiating relic.

Potential dark matter candidates due to their stability.

Abstract

In this letter we study the process of Hawking radiation of a black hole assuming the existence of a limiting physical curvature scale. The particular model is constructed using the Limiting Curvature Hypothesis (LCH) and in the context of two-dimensional dilaton gravity. The black hole solution exhibits properties of the standard Schwarzschild solution at large values of the radial coordinate. However, near the center, the black hole is nonsingular and the metric becomes that of de Sitter spacetime. The Hawking temperature is calculated using the method of complex paths. We find that such black holes radiate eternally and never completely evaporate. The final state is an eternally radiating relic, near the fundamental scale, which should make a viable dark matter candidate. We briefly comment on the black hole information loss problem and the production of such black holes in collider experiments.