# Dirichlet Branes and Ramond-Ramond charges.

@article{Polchinski1995DirichletBA, title={Dirichlet Branes and Ramond-Ramond charges.}, author={Polchinski}, journal={Physical review letters}, year={1995}, volume={75 26}, pages={ 4724-4727 } }

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…

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