Massive Superstrings are Black Holes

TL;DR

This paper argues that superstring states at the Planck scale cannot ignore gravitational effects and effectively become Kerr black holes in the classical limit, highlighting a deep connection between string theory and black hole physics.

Contribution

It introduces the idea that massive superstring states naturally evolve into black holes when gravitational backreaction is considered, bridging string theory and classical black hole solutions.

Findings

Superstring states at the Planck mass are inconsistent without considering gravity.

Massive superstrings behave as Kerr black holes in the classical limit.

Implications for quantum gravity and black hole formation are discussed.

Abstract

We argue that it is inconsistent to ignore the gravitational backreaction for on-shell superstring states at the Planck mass and beyond, and that these quantum states become Kerr black holes in the classical limit. Consequences are discussed.