Tachyon condensation and off-shell gravity/gauge duality

TL;DR

This paper explores how tachyon condensation in string theory can be understood through gravity/gauge duality, using regularization schemes to model off-shell black hole configurations and their evolution towards stability.

Contribution

It introduces a duality framework linking off-shell tachyon dynamics to off-shell black holes, providing a gravitational perspective on tachyon condensation.

Findings

Off-shell black hole configurations model tachyon condensation.

The off-shell free energy guides the evolution toward stable black holes.

Regularization schemes stabilize the canonical ensemble for analysis.

Abstract

We investigate quasilocal tachyon condensation by using gravity/gauge duality. In order to cure the IR divergence due to a tachyon, we introduce two regularization schemes: AdS space and a d=10 Schwarzschild black hole in a cavity. These provide stable canonical ensembles and thus are good candidates for the endpoint of tachyon condensation. Introducing the Cardy-Verlinde formula, we establish the on-shell gravity/gauge duality. We propose that the stringy geometry resulting from the off-shell tachyon dynamics matches onto the off-shell AdS black hole, where "off-shell" means non-equilibrium configuration. The instability induced by condensation of a tachyon behaves like an off-shell black hole and evolves toward a large stable black hole. The off-shell free energy and its derivative ($\beta$-function) are used to show the off-shell gravity/gauge duality for the process of tachyon condensation. Further, d=10 Schwarzschild black hole in a cavity is considered for the Hagedorn transition as a possible explanation of the tachyon condensation.