A Note on Singular Black Holes

TL;DR

This paper explores the entropy of singular black holes lacking finite-area horizons, proposing they can possess nonzero entropy based on supergravity and string theory, and refines arguments for their microstates.

Contribution

It introduces the idea that certain singular black holes can have nonzero entropy and refines previous arguments for their microstates.

Findings

Singular black holes may have nonzero entropy.

Refined arguments support the existence of microstates for these black holes.

Implications for black hole thermodynamics and quantum gravity.

Abstract

We reconsider entropy of black holes which do not have finite area horizon. It is suggested that some of them should have nonzero entropy from both supergravity and string theory point of view. We also refine our arguments in our previous papers for the existence of the microstates of the black hole.