Brane-Antibrane Action from Boundary String Field Theory

TL;DR

This paper develops a boundary string field theory framework for brane-antibrane systems, deriving tachyon potentials, world-volume actions, RR couplings, and including effects of transverse scalars, advancing the understanding of their dynamics.

Contribution

It provides an exact boundary string field theory description of brane-antibrane systems, including tachyon condensation, RR couplings via superconnections, and Myers terms, which was not previously achieved.

Findings

Derived the tachyon potential and condensation process.

Calculated RR couplings using superconnections.

Included Myers terms with transverse scalars.

Abstract

In this paper we give the boundary string field theory description of brane-antibrane systems. From the world-sheet action of brane-antibrane systems we obtain the tachyon potential and discuss the tachyon condensation exactly. We also find the world-volume action including the gauge fields. Moreover we determine RR-couplings exactly for non-BPS branes and brane-antibranes. These couplings are written by superconnections and correspond to K^1(M) and K^0(M) for the non-BPS branes and brane-antibranes, respectively. We also show that Myers terms appear if we include the transverse scalars in the boundary sigma model action.