Non-degenerate Invariant (Super)Symmetric Bilinear Forms on Simple Lie (Super)Algebras

Sofiane Bouarroudj, Andrey Krutov, Dimitry Leites, Irina Shchepochkina

Research output: Contribution to journalArticlepeer-review


We review the list of non-degenerate invariant (super)symmetric bilinear forms (briefly: NIS) on the following simple (relatives of) Lie (super)algebras: (a) with symmetrizable Cartan matrix of any growth, (b) with non-symmetrizable Cartan matrix of polynomial growth, (c) Lie (super)algebras of vector fields with polynomial coefficients, (d) stringy a.k.a. superconformal superalgebras, (e) queerifications of simple restricted Lie algebras. Over algebraically closed fields of positive characteristic, we establish when the deform (i.e., the result of deformation) of the known finite-dimensional simple Lie (super)algebra has a NIS. Amazingly, in most of the cases considered, if the Lie (super)algebra has a NIS, its deform has a NIS with the same Gram matrix after an identification of bases of the initial and deformed algebras. We do not consider odd parameters of deformations. Closely related with simple Lie (super)algebras with NIS is the notion of doubly extended Lie (super)algebras of which affine Kac–Moody (super)algebras are the most known examples.

Original languageEnglish (US)
Pages (from-to)897-941
Number of pages45
JournalAlgebras and Representation Theory
Issue number5
StatePublished - Oct 1 2018


  • Killing form
  • Lie superalgebra
  • Positive characteristic

ASJC Scopus subject areas

  • General Mathematics


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