Boundary State Description of Tachyon Condensation

TL;DR

This paper develops a boundary state framework for describing vortex-type tachyon condensation in brane-antibrane systems, revealing how lower-dimensional D-branes' RR-charge emerges and extending the analysis to orbifold and higher codimension cases.

Contribution

It generalizes the boundary state description to vortex-type tachyon condensation, including orbifold cases and higher codimensions, building on previous kink-type models.

Findings

RR-charge of lower D-branes emerges from boundary states

Twisted sector in orbifolds can be treated similarly to untwisted

Framework applicable to higher codimension tachyon condensations

Abstract

We construct the explicit boundary state description of the vortex-type (codimension two) tachyon condensation in brane-antibrane systems generalizing the known result of the kink-type (Frau et al. hep-th/9903123). In this description we show how the RR-charge of the lower dimensional D-branes emerges. We also investigate the tachyon condensation in T^4/Z_2 orbifold and find that the twisted sector can be treated almost in the same way as the untwisted sector from the viewpoint of the boundary state. Further we discuss the higher codimension cases.