String scale black holes at large $D$

TL;DR

This paper explores black holes at string scale temperatures using large D expansion, suggesting they can surpass the Hagedorn temperature before transitioning to highly excited strings.

Contribution

It connects large D black holes to two-dimensional models, enabling analysis of black holes at string scale temperatures and their transition to string states.

Findings

Black holes can exceed the Hagedorn temperature.

A transition to highly excited strings is likely at higher temperatures.

Large D expansion links black holes to well-understood 2D models.

Abstract

We study aspects of black holes near the Hagedorn temperature. The large dimension expansion introduced by Soda, Emparan, Grumiller and Tanabe connects them to the well studied two dimensional black hole based on $SL(2)_k/U(1)$. This allows us to explore black holes at string scale temperatures. We argue that the black hole can surpass the Hagedorn temperature, but at a somewhat larger temperature it is likely to turn over to a highly excited string.