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Dirichlet Branes and Ramond-Ramond Charges

Joseph Polchinski

Physical Review Letters · 1995 · 2,859 citationsOpen access

doi.org/10.1103/physrevlett.75.4724Free full text

Abstract

We show that D-branes, extended objects defined by mixed Dirichlet-Neumann boundary conditions, break half the supersymmetries of the type II superstring and carry a complete set of electric and magnetic Ramond-Ramond charges. The product of the electric and magnetic charges is a single Dirac unit, and the quantum of charge is that required by string duality. This is strong evidence that D-branes are intrinsic to type II string theory and are the Ramond-Ramond sources needed for string duality. Also, we find in the IIa string a 9-form potential, which gives an effective cosmological constant.

Cite this paper

Polchinski, J. (1995). Dirichlet branes and ramond-ramond charges. Physical Review Letters, 75(26), 4724–4727. https://doi.org/10.1103/physrevlett.75.4724

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