A stringy glimpse into the black hole horizon

TL;DR

This paper discusses how non-perturbative effects in string theory modify the classical structure of 2D black holes, potentially offering insights into quantum black holes in higher-dimensional spacetimes like AdS5×S5.

Contribution

It demonstrates that non-perturbative string effects make the region behind the horizon singular at the classical level, providing a new perspective on quantum black holes.

Findings

Non-perturbative effects induce classical singularities behind the horizon.

The 2D black hole model offers insights into higher-dimensional quantum black holes.

Classical analysis reveals horizon modifications due to stringy effects.

Abstract

We elaborate on the recent claim [arXiv:1702.03583] that non-perturbative effects in $\alpha'$, which are at the core of the FZZ duality, render the region just behind the horizon of the $SL(2,\mathbb{R})_k/U(1)$ black hole singular already at the classical level ($g_s=0$). We argue that the 2D classical $SL(2,\mathbb{R})_k/U(1)$ black hole could shed some light on quantum black holes in higher dimensions including large black holes in $AdS_5\times S^5$.