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 of the ground ring, so the latter can be used to constrain the S-matrix of the theory. We also comment on the inequivalence of BRST cohomologies of the N=2 string theory in different pictures.
Original language | English |
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Pages (from-to) | 419-440 |
Number of pages | 22 |
Journal | Nuclear Physics B |
Volume | 729 |
Issue number | 3 |
DOIs | |
Publication status | Published - 28 Nov 2005 |