paper

Dirichlet-Branes and Ramond-Ramond Charges

arXiv:hep-th/9510017 · doi:10.1103/PhysRevLett.75.4724

Abstract

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.

LaTeX, 10 pages. Minor typos corrected in eq. 8, 9, 13. References added to [11]

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