Whittaker pairs for the Virasoro algebra and the Gaiotto - BMT states

Abstract

In this paper we analyze Whittaker modules for two families of Wittaker pairs related to the subalgebras of the Virasoro algebra generated by L_r,..., L_{2r} and L_1,L_n. The structure theorems for the corresponding universal Whittaker modules are proved and some of their consequences are derived. All the Gaiotto {arXiv:0908.0307} and the Bonelli-Maruyoshi-Tanzini {arXiv:1112.1691} states in an arbitrary Virasoro algebra Verma module are explicitly constructed.

19 pages, Revision of Section 3 (Theorems 3.5, 3.6 and Corollary 3.7 of Section 3 of the first published version are valid only in the case of $n=3$), correction of Lemma 2.7, one reference added

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