Dirichlet-Branes and Ramond-Ramond Charges

Details Dirichlet-Branes and Ramond-Ramond Charges Dirichlet-Branes and Ramond-Ramond Charges

1995-10-05

arxiv.org/abs/hep-th/9510017v3

Phys.Rev.Lett.75:4724-4727,1995

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

10.1103/PhysRevLett.75.4724

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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