Orthosymplectic Feigin-Semikhatov duality

Abstract

We study the representation theory of the subregular W-algebra ${\mathcal{W}}^k({\mathfrak{so}}_{2n+1},f_{sub})$ of type B and the principal W-superalgebra ${\mathcal{W}}^{\ell }({\mathfrak{osp}}_{2|2n})$, which are related by an orthosymplectic analogue of Feigin-Semikhatov duality in type A. We establish a block-wise equivalence of weight modules over the W-superalgebras by using the relative semi-infinite cohomology functor and spectral flow twists, which generalizes the result of Feigin-Semikhatov-Tipunin for the N=2 superconformal algebra. In particular, the correspondence of Wakimoto type free field representations is obtained. When the level of the subregular W-algebra is exceptional, we classify the simple modules over the simple quotients ${\mathcal{W}}_k({\mathfrak{so}}_{2n+1},f_{sub})$ and ${\mathcal{W}}_{\ell }({\mathfrak{osp}}_{2|2n})$ and derive the character formulae.

arXiv comment61 pages in English, accepted version (to appear in Sel. Math. New Ser.)

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Cited by in corpus (1)

• Connecting affine $\mathcal{W}$-algebras: A case study on ${\mathfrak{sl}}_4$