Phys. Rev. Lett. 75, 4724–4727 (1995)Dirichlet Branes and Ramond-Ramond ChargesReceived 10 October 1995; published in the issue dated 25 December 1995 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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.4724
DOI:
10.1103/PhysRevLett.75.4724
PACS:
11.25.Hf, 11.30.Pb
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