Winding Strings and Decay of D-Branes with Flux

Abstract

We study the boundary state associated with the decay of an unstable D-brane with uniform electric field, 1>e>0 in the string units. Compactifying the D-brane along the direction of the electric field, we find that the decay process is dominated by production of closed strings with some winding numbers; closed strings produced are such that the winding mode carries precisely the fraction $e$ of the individual string energy. This supports the conjecture that the final state at tree level is composed of winding strings with heavy oscillations turned on. As a corollary, we argue that the closed strings disperse into spacetime at a much slower rate than the case without electric field.

arXiv comment14 pages, harvmac, minor changes, clarified gauge choice, version to appear in JHEP

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• Confinement and Non-perturbative Tachyons in Brane-Antibrane Systems