Closed-string Tachyon Condensation and the On-shell Effective Action of Open-string Tachyons

TL;DR

This paper investigates how closed-string tachyon condensation influences the on-shell effective action of open-string tachyons, incorporating one-loop quantum corrections and using a sigma-model approach with boundary string field theory techniques.

Contribution

It introduces a method to incorporate closed-string tachyon effects into the open-string effective action using boundary string field theory and worldsheet insertions.

Findings

Closed-string tachyon effects can be incorporated into open-string effective actions.

One-loop quantum corrections to the open-string action are analyzed.

Boundary string field theory provides a framework for these calculations.

Abstract

We study how the effect of closed-string tachyon condensation can enter into the on-shell effective action of open-string tachyons in the bosonic case. We also consider open-string one-loop quantum corrections to the on-shell action. We use a sigma-model approach with boundary terms, and we utilize some results of boundary string field theory (BSFT) to define the on-shell effective action. We regard D-instanton-like objects with appropriate weight as closed-string tachyon tadpoles, and we insert them into worldsheets to analyze the effect of closed-string tachyons.