Non-BPS black holes and self-interacting fundamental strings

TL;DR

This paper explores the transition from string states to black holes in non-BPS scenarios by analyzing string configurations, entropy, and one-loop corrections as the string coupling increases, indicating a possible black hole formation.

Contribution

It provides a rigorous analysis of string configurations and entropy in non-BPS cases, highlighting the dominance of compact states with horizon-sized spread as coupling grows.

Findings

String states become dominated by compact configurations at strong coupling.

One-loop corrections are significant near the transition to black hole regimes.

The size of string states approaches the horizon radius of the corresponding black holes.

Abstract

The string-black hole correspondence principle can be investigated in the non-BPS scenario by studying the string configuration and entropy when the string coupling is slowly increased. Through a rigorous analysis, it is shown how an ensemble of string states at fixed mass and Neveu-Schwarz charges gets dominated in any dimension by compact states for which the one-loop corrections are important (possibly signaling the transition to a black hole regime/description) and with a size (spread) within the horizon radius of the expected correspondent black holes.