Gauging of T-Duality Invariant Worldsheet String Actions

TL;DR

This paper demonstrates how T-duality invariant worldsheet string actions can be integrated to recover conventional gauged string actions or alternative T-duality invariant forms, clarifying their relationships.

Contribution

It shows the equivalence of T-duality invariant actions with traditional gauged string actions through integration of dual coordinates and gauge fields.

Findings

Integration of dual coordinates yields conventional gauged actions.

Gauge field integration produces T-duality invariant actions matching earlier results.

Clarifies the relationship between T-duality invariant and conventional string actions.

Abstract

T-Duality invariant worldsheet string actions, recently written down by Schwarz and Sen, are coupled to the worldsheet gauge fields. It is shown that the integration of the dual coordinates gives the conventional, vector, axial and chiral, gauged string actions for the appropriate choice of the gauged isometries. Alternatively, the gauge field integration is shown to give a T-duality invariant action which matches with the corresponding results known earlier.