Wess-Zumino Term in Tachyon Effective Action

TL;DR

This paper demonstrates that the RR field source from boundary states matches a specific Wess-Zumino term in the tachyon effective action, providing insights into tachyon dynamics and RR charge conservation.

Contribution

It identifies a particular Wess-Zumino term in the tachyon effective action that reproduces the RR field source from boundary state calculations.

Findings

RR field source matches Wess-Zumino term predictions

Derived a simple expression for the S-charge of rolling tachyons

Established consistency between boundary state and effective action approaches

Abstract

We show that the source of RR field computed from the boundary state describing the decay of a non-BPS brane is reproduced by a particular form of the Wess-Zumino term in the tachyon effective action. We also obtain a simple expression of the S-charge associated with rolling tachyons.