Correspondence between genus expansion and $\alpha^{\prime}$ expansion in string theory

TL;DR

This paper reveals a precise correspondence between the $ ext{alpha'}$ expansion of strings in AdS space and the genus expansion in string theory, providing a closed-form expression and insights into strong coupling behavior.

Contribution

It establishes an exact link between the $ ext{alpha'}$ expansion in AdS and the genus expansion, enabling a closed-form expression for all $ ext{alpha'}$ values and conjecturing the $g_s$ dependence.

Findings

Sum of $ ext{alpha'}$ expansion in AdS can be expressed in closed form.

T-dual of this sum matches the genus expansion in string theory.

Conjecture of the exact $g_s$ dependence in strongly coupled theories.

Abstract

In this paper, we demonstrate that locally, the $\alpha^{\prime}$ expansion of a string propagating in AdS can be summed into a closed expression, where the $\alpha'$ dependence is manifested. The T-dual of this sum exactly matches the expression controlling all genus expansion in the Goparkumar-Vafa formula, which in turn also matches the loop expansion of the Chern-Simons gauge theory. We therefore find an exact correspondence between the $\alpha^{\prime}$ expansion for a string moving in AdS and the genus expansion of a string propagating in four dimensional flat spacetime. We are then able to give a closed form of the $\alpha'$ expansion for all values of $\sqrt{\alpha'}/R_{AdS}$. Moreover, the correspondence makes it possible to conjecture the exact $g_s$ dependence of the strongly coupled theories.