Black bounces and remnants in dilaton gravity

TL;DR

This paper introduces a family of dilaton gravity models with bouncing black hole solutions that connect different flat regions, exploring their stability, thermodynamics, and potential implications for the information paradox.

Contribution

It presents new dilaton gravity models with stable bouncing solutions and analyzes their thermodynamic properties and potential role as black hole remnants.

Findings

Inner Cauchy horizons are stable under certain conditions.

Extremal bounces have zero temperature, acting as remnants.

Quantum fluctuations might dissolve horizons, addressing the information paradox.

Abstract

We propose a family of dilaton gravity models possessing bouncing solutions with interiors connecting separate asymptotically flat regions. We demonstrate that inner Cauchy horizons are stable given certain initial conditions. We study causal structure and evaluate thermodynamic properties of black bounces using Euclidean methods. Extremal bounces have zero temperature and can be considered as remnants. We speculate that quantum fluctuations can dissolve event horizons in case of black bounces providing a possible resolution to the information paradox.