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arxiv: hep-th/0601024 · v2 · submitted 2006-01-05 · ✦ hep-th

Ghost D-branes

Takuya Okuda , Tadashi Takayanagi This is my paper
classification ✦ hep-th
keywords ghostd-branetyped-branesgaugeclosedd9-branesheterotic
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We define a ghost D-brane in superstring theories as an object that cancels the effects of an ordinary D-brane. The supergroups U(N|M) and OSp(N|M) arise as gauge symmetries in the supersymmetric world-volume theory of D-branes and ghost D-branes. A system with a pair of D-brane and ghost D-brane located at the same location is physically equivalent to the closed string vacuum. When they are separated, the system becomes a new brane configuration. We generalize the type I/heterotic duality by including n ghost D9-branes on the type I side and by considering the heterotic string whose gauge group is OSp(32+2n|2n). Motivated by the type IIB S-duality applied to D9- and ghost D9-branes, we also find type II-like closed superstrings with U(n|n) gauge symmetry.

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