Joseph Polchinski

Dirichlet Branes and Ramond-Ramond Charges

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 superst...

Critical behavior of random surfaces in one dimension

Higher order graviton scattering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="normal">atrix</mml:mi><mml:mo>)</mml:mo></mml:math>theory

In matrix theory the effective action for graviton-graviton scattering is a double expansion in the relative velocity and inverse separation. We discuss the systematics of this ...