Another Length Scale in String Theory?

TL;DR

The paper proposes the existence of an additional, shorter length scale in string theory, related to the Planck mass, which emerges at weak coupling and differs from the traditional string scale.

Contribution

It introduces a new dynamical length scale in string theory, proportional to the inverse of the string coupling, expanding understanding of string dynamics at weak coupling.

Findings

Identification of a new length scale ~ m_s/g_s

This scale coincides with the Planck mass in four dimensions

Implications for string dynamics and quantum gravity

Abstract

We suggest that some of the remarkable results on stringy dynamics which have been found recently indicate the existence of another dynamical length scale in string theory that, at weak coupling, is much shorter than the string scale. This additional scale corresponds to a mass $\sim m_{\rm s}/g_{\rm s}$ where $m_{\rm s}$ is the square root of the string tension and $g_{\rm s}$ is the string coupling constant. In four dimensions this coincides with the Planck mass.