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Remarks on the BRST-cohomology for $c_M > 1$ matter coupled to
``Liouville gravity"
Remarks on the BRST-cohomology for $c_M > 1$ matter coupled to
``Liouville gravity"
1992-02-11
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arxiv.org/abs/hep-th/9202035v1
Phys.Lett. B282 (1992) 309-313
Physics
High Energy Physics
High Energy Physics - Theory
10 pages
Scientific paper
10.1016/0370-2693(92)90644-J
We describe the (chiral) BRST-cohomology of matter with central charge $10$) and ghost-numbers 0 or $-1$ (for $r<0$). The (chiral) ground ring is isomorphic to a subring of the $c_M =1$ theory which is $(xy)^n,\ n=0,1,2,\ldots$, and there are {\it no} non-trivial currents acting on the ground ring. In case b) there is no non-trivial relative cohomology for non-zero ghost numbers and, for zero ghost number, the cohomology groups are isomorphic to a $(D-1)$-dimensional on-shell ``transverse" Fock space. The only exceptions are at level 1 for vanishing matter momentum and $p_L=Q_L(1+r)$ with $r=\pm 1$, where one has one more ghost-number zero and a ghost-number $r$ cohomology state. All these results follow quite easily from the existing literature.
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