Non-degenerate invariant (super)symmetric bilinear forms on simple Lie (super)algebras

Abstract

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.

arXiv comment42 pages. Definitions of certain Lie (super)algebras follow previous works of some of the authors

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Cited by in corpus (7)

• Classification of simple Lie superalgebras in characteristic $2$
• Computer-aided study of double extensions of restricted Lie superalgebras preserving the non-degenerate closed 2-forms in characteristic 2
• Nondegenerate invariant symmetric bilinear forms on simple Lie superalgebras in characteristic 2
• Inverses of Cartan matrices of Lie algebras and Lie superalgebras
• Quantised ${\mathfrak{sl}}_2$-differential algebras
• Quadratic symplectic Lie superalgebras over filiform modules
• Supertraces on queerified algebras