  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.

High Energy Physics - Theory