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Summing Over World-Sheet Boundaries

Michael B. Green, Joe Polchinski

hep-tharXiv:hep-th/9406012

Abstract

The moduli associated with boundaries in a Riemann surface are parametrized by the positions and strengths of electric charges. This suggests a method for summing over orientable Riemann surfaces with Dirichlet boundary conditions on the embedding coordinates. A light-cone parameterization of such boundaries is also discussed.

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