D-Sphalerons and the Topology of String Configuration Space
Abstract
We show that unstable D-branes play the role of ``D-sphalerons'' in string theory. Their existence implies that the configuration space of Type II string theory has a complicated homotopy structure, similar to that of an infinite Grassmannian. In particular, the configuration space of Type IIA (IIB) string theory on 10 has non-trivial homotopy groups πk for all k even (odd).
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