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arxiv: hep-th/9510017 · v3 · submitted 1995-10-05 · ✦ hep-th

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Dirichlet-Branes and Ramond-Ramond Charges

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classification ✦ hep-th
keywords stringchargesramond-ramonddirichlet-branesdualityelectricmagneticrequired
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We show that Dirichlet-branes, extended objects defined by mixed Dirichlet-Neumann boundary conditions in string theory, break half of the supersymmetries of the type~II superstring and carry a complete set of electric and magnetic Ramond-Ramond charges. We also find that the product of the electric and magnetic charges is a single Dirac unit, and that the quantum of charge takes the value required by string duality. This is strong evidence that the Dirchlet-branes are intrinsic to type II string theory and are the Ramond-Ramond sources required by string duality. We also note the existence of a previously overlooked 9-form potential in the IIa string, which gives rise to an effective cosmological constant of undetermined magnitude.

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