Are Extremal 2D Black Holes Really Frozen ?

TL;DR

This paper investigates how considering a dynamical geometry in 2D charged black holes affects Hawking radiation, revealing a nonthermal component and implications for extremal black holes.

Contribution

It introduces a dynamical geometry approach to Hawking radiation in 2D charged black holes, highlighting nonthermal effects absent in fixed-background models.

Findings

Nonthermal radiation component identified in dynamical models

Implications for extremal black hole thermodynamics

Modified radiation spectrum due to geometry dynamics

Abstract

In the standard methodology for evaluating the Hawking radiation emanating from a black hole, the background geometry is fixed. Trying to be more realistic we consider a dynamical geometry for a two-dimensional charged black hole and we evaluate the Hawking radiation as tunneling process. This modification to the geometry gives rise to a nonthermal part in the radiation spectrum. We explore the consequences of this new term for the extremal case.