English

On finite dimensional representations of finite W-superalgebras

Representation Theory 2022-10-18 v5

Abstract

Let g=g0ˉ+g1ˉ\mathfrak{g}=\mathfrak{g}_{\bar{0}}+\mathfrak{g}_{\bar{1}} be a basic Lie superalgebra, W0\mathcal{W}_0 (resp.W\mathcal{W}) be the finite W-(resp.super-) algebras constructed from a fixed nilpotent element in g0ˉ\mathfrak{g}_{\bar{0}}. Based on a relation between finite W-algebra W0\mathcal{W}_0 and W-superalgebra W\mathcal{W} found recently by the author and Shu, we study the finite dimensional representations of finite W-superalgebras in this paper. We first formulate and prove a version of Premet's conjecture for the finite W-superalgebras from basic simple Lie superalgebras. As in the W-algebra case, the Premet's conjecture is very close to give a classification to the finite dimensional simple W\mathcal{W}-modules. In the case of \ggg is Lie superalgebras of basic type \Rmnum{1}, we prove the set of simple W\mathcal{W}-supermodules is bijective with that of simple W0\mathcal{W}_0-modules; presenting a triangular decomposition to the tensor product of W\mathcal{W} with a Clifford algebra, we also give an algorithm to compute the character of the finite dimensional simple W\mathcal{W}-supermodules with integral central character.

Keywords

Cite

@article{arxiv.2101.07345,
  title  = {On finite dimensional representations of finite W-superalgebras},
  author = {Husileng Xiao},
  journal= {arXiv preprint arXiv:2101.07345},
  year   = {2022}
}

Comments

V2, typos corrected,16 pages, a part overlap with arxiv:2002.10604. V3 a bad but not serious error is corrected( see Proposition 4.1) V4 accepted version