Geodesic
Noncritical $W$-strings and Minimal Models
Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 3, pp. 343-357 Cet article a éte moissonné depuis la source Math-Net.Ru

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We perform a BRST analysis of the physical states described by a general noncritical $W$-string. A crucial feature of our analysis is that we introduce a special basis in the Hilbert space of physical states in which the BRST operator splits into a nested sum of nilpotent BRST operators. We argue that the cohomology of each nilpotent BRST operator occurring in the “nested” sum is closely related to a specific $W$ mimimal model. We discuss in detail the special case of the noncritical $W_3$-string. 
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É. Bergshoeff. Noncritical $W$-strings and Minimal Models. Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 3, pp. 343-357. http://geodesic.mathdoc.fr/item/TMF_1994_98_3_a4/

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