Complexity for Modules Over the Classical Lie Superalgebra gl(m|n)

Abstract

Let $\mathfrak{g}={\mathfrak{g}}_{\bar{0}}\oplus {\mathfrak{g}}_{\bar{1}}$ be a classical Lie superalgebra and $\mathcal{F}$ be the category of finite dimensional $\mathfrak{g}$-supermodules which are completely reducible over the reductive Lie algebra ${\mathfrak{g}}_{\bar{0}}$. In an earlier paper the authors demonstrated that for any module $M$ in $\mathcal{F}$ the rate of growth of the minimal projective resolution (i.e., the complexity of $M$) is bounded by the dimension of ${\mathfrak{g}}_{\bar{1}}$. In this paper we compute the complexity of the simple modules and the Kac modules for the Lie superalgebra $\mathfrak{gl}(m|n)$. In both cases we show that the complexity is related to the atypicality of the block containing the module.

32 pages

References in corpus (2)

• Cohomology of generalized supergrassmannians and character formulae for basic classical Lie superalgebras
• Differentiating the Weyl generic dimension formula and support varieties for quantum groups

Cited by in corpus (3)

• On support varieties for Lie superalgebras and finite supergroup schemes
• Grothendieck rings for Lie superalgebras and the Duflo-Serganova functor
• Support varieties and modules of finite projective dimension for modular Lie superalgebras (with an appendix on homological dimensions over Noether Algebras by Luchezar L. Avramov and Srikanth B. Iyengar)