# 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
}
}
• Polchinski
• Published 5 October 1995
• Physics
• Physical review letters
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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