On the interior of (Quantum) Black Holes

TL;DR

This paper explores the physical process of particle tunneling through the inner horizon of quantum black holes, revealing a non-thermal particle flux that impacts black hole interior stability.

Contribution

It introduces a model for particle tunneling at the inner horizon of quantum black holes and analyzes its effects on black hole dynamics and stability.

Findings

Tunneling produces a non-thermal particle flux.

High temperature of the inner horizon is calculated.

Tunneling influences the stability of the black hole interior.

Abstract

Different approaches to quantum gravity conclude that black holes may possess an inner horizon, in addition to the (quantum corrected) outer `Schwarzschild' horizon. In this paper we assume the existence of this inner horizon and explain the physical process that might lead to the tunneling of particles through it. It is shown that the tunneling would produce a flux of particles with a spectrum that deviates from the pure thermal one. Under the appropriate approximation the extremely high temperature of this horizon is calculated for an improved quantum black hole. It is argued that the flux of particles tunneled through the horizons affects the dynamics of the black hole interior leading to an endogenous instability.