Holomorphic Tachyons and Fractional D-branes

TL;DR

This paper investigates how holomorphic tachyon condensation on brane-antibrane systems in orbifold theories leads to the formation of fractional D-branes, with results supported by boundary string field theory and RR-charge calculations.

Contribution

It demonstrates that holomorphic tachyon fields induce fractional D-branes in orbifold settings, confirming the process through boundary supersymmetry and RR-charge consistency.

Findings

Holomorphic tachyon condensation produces fractional D-branes.

Boundary N=2 supersymmetry ensures the exactness of results.

RR-charge calculations confirm the generated branes.

Abstract

We study tachyon condensation on brane-antibrane systems in orbifold theories from the viewpoint of boundary string field theory. We show that the condensation of holomorphic tachyon fields generates various fractional D-branes. The boundary N=2 supersymmetry in the world-sheet theory ensures this result exactly. Furthermore, our results are consistent with the twisted RR-charges from detailed calculations of boundary states. We also discuss the generation of RR-charges due to holomorphic tachyon fields on multiple brane-antibrane pairs in flat space.