Defining relations for nilpotent subalgebras of modular classical Lie algebras

Dzhumadil’daev, Askar; Ibraev, Sh. Sh.

doi:10.1070/rm1998v053n05abeh000081

Cited by 1 publication

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“…In several papers [31,32,33,78,90,92], with difficult results clearly explained, N. Chebochko, and her scientific advisor, M. Kuznetsov, gave an overview of the situation for Lie algebras of the form g(A) and g(A) (i) /c. In [32], Chebochko writes (footnotes are ours): "According to [40], for p = 3, the Lie algebra C 2 is the only algebra among the series A n , B n , C n , D n that admits nontrivial deformations. In [126], it was established that over a field of characteristic p > 3 all the classical a Lie superalgebras are rigid.…”

Section: Chebochko's Computations Of Deformationsmentioning

confidence: 99%

Deformations of Symmetric Simple Modular Lie (Super)Algebras

Bouarroudj¹,

Grozman²,

Leites³

2023

SIGMA

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We say that a Lie (super)algebra is ''symmetric'' if with every root (with respect to the maximal torus) it has the opposite root of the same multiplicity. Over algebraically closed fields of positive characteristics (up to 7 or 11, enough to formulate a general conjecture), we computed the cohomology corresponding to the infinitesimal deformations of all known simple finite-dimensional symmetric Lie (super)algebras of rank <9, except for superizations of the Lie algebras with ADE root systems, and queerified Lie algebras, considered only partly. The moduli of deformations of any Lie superalgebra constitute a supervariety. Any infinitesimal deformation given by any odd cocycleis integrable. All deformations corresponding to odd cocycles are new. Among new results are classifications of the cocycles describing deforms (results of deformations) of the 29-dimensional Brown algebra in characteristic 3, of Weisfeiler-Kac algebras and orthogonal Lie algebras without Cartan matrix in characteristic 2. Open problems: describe non-isomorphic deforms and equivalence classes of cohomology theories. Appendix: For several modular analogs of complex simple Lie algebras, and simple Lie algebras indigenous to characteristics 3 and 2, we describe the space of cohomology with trivial coefficients. We show that the natural multiplication in this space is very complicated.

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