Summing over World-sheet Boundaries

  title={Summing over World-sheet Boundaries},
  author={Michael B. Green},
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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