D-branes , open string vertex operators , and Ext groups

  title={D-branes , open string vertex operators , and Ext groups},
  author={Sheldon Katz and Eric J. Sharpe},
In this note we explicitly work out the precise relationship between Ext groups and massless modes of D-branes wrapped on complex submanifolds of Calabi-Yau manifolds. Specifically, we explicitly compute the boundary vertex operators for massless Ramond sector states, in open string B models describing Calabi-Yau manifolds at large radius, directly in BCFT using standard methods. Naively these vertex operators are in one-to-one correspondence with certain sheaf cohomology groups (as is typical… CONTINUE READING
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