Boundary String Field Theory of the DDbar System

TL;DR

This paper develops a boundary string field theory framework for analyzing tachyon condensation in the D-Dbar system, incorporating gauge fields and deriving RR-couplings using superconnections, establishing an exact index theorem connection.

Contribution

It introduces a novel boundary string field theory approach that naturally integrates gauge fields and derives exact RR-couplings via superconnections in the D-Dbar system.

Findings

Derived RR-couplings expressed through superconnections

Established a connection to an index theorem showing exact results

Unified gauge fields and tachyons in the boundary string field theory framework

Abstract

We develop the boundary string field theory approach to tachyon condensation on the DDbar system. Particular attention is paid to the gauge fields, which combine with the tachyons in a natural way. We derive the RR-couplings of the system and express the result in terms of Quillen's superconnection. The result is related to an index theorem, and is thus shown to be exact.