Evidence for a null entropy of extremal black holes

TL;DR

This paper argues that extremal black holes have zero entropy based on quantum, thermodynamic, and statistical physics considerations, and shows that particle capture transforms extremal black holes into nonextremal ones.

Contribution

It provides a novel argument supporting zero entropy for extremal black holes and demonstrates the nonextremal outcome after particle capture within a quantum framework.

Findings

Extremal black holes likely have zero entropy.

Particle capture leads to nonextremal black holes.

Supports a quantum perspective on black hole thermodynamics.

Abstract

We present some arguments in support of a {\it zero} entropy for {\it extremal} black holes. These rely on a combination of both quantum, thermodynamic, and statistical physics arguments. This result may shed some light on the nature of these extreme objects. In addition, we show that within a {\it quantum} framework the capture of a particle by an initially extremal black hole always results with a final nonextremal black hole.