The ground ring of N=2 minimal string theory

  title={The ground ring of N=2 minimal string theory},
  author={Anatoly Konechny and Andrei Parnachev and David A. Sahakyan},
  journal={Nuclear Physics},
Abstract We study the N = 2 string theory or the N = 4 topological string on the deformed CHS background. That is, we consider the N = 2 minimal model coupled to the N = 2 Liouville theory. This model describes holographically the topological sector of little string theory. We use degenerate vectors of the respective N = 2 Verma modules to find the set of BRST cohomologies at ghost number zero—the ground ring, and exhibit its structure. Physical operators at ghost number one constitute a module… Expand
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