Abstract
We find the characteristic identities for the split Casimir operator in the defining and adjoint representations of the \(osp(M|N)\) and \(s\ell(M|N)\) Lie superalgebras. These identities are used to build the projectors onto invariant subspaces of the representation \(T^{\otimes 2}\) of the \(osp(M|N)\) and \(s\ell(M|N)\) Lie superalgebras in the cases where \(T\) is the defining or adjoint representation. For the defining representation, the \(osp(M|N)\)- and \(s\ell(M|N)\)-invariant solutions of the Yang–Baxter equation are expressed as rational functions of the split Casimir operator. For the adjoint representation, the characteristic identities and invariant projectors obtained are considered from the standpoint of a universal description of Lie superalgebras by means of the Vogel parameterization. We also construct a universal generating function for higher Casimir operators of the \(osp(M|N)\) and \(s\ell(M|N)\) Lie superalgebras in the adjoint representation.
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Notes
By weight spaces, we mean spaces on which \(\widehat{C}_T\) acts by a Jordan cell with the corresponding eigenvalue.
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Acknowledgments
We thank S. O. Krivonos for the stimulating discussions and comments.
Funding
The research was supported by the Russian Science Foundation (Grant No. 19-11-00131).
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Translated from Teoreticheskaya i Matematicheskaya Fizika, 2022, Vol. 210, pp. 259-301 https://doi.org/10.4213/tmf10172.
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Isaev, A.P., Provorov, A.A. Split Casimir operator and solutions of the Yang–Baxter equation for the \(osp(M|N)\) and \(s\ell(M|N)\) Lie superalgebras, higher Casimir operators, and the Vogel parameters. Theor Math Phys 210, 224–260 (2022). https://doi.org/10.1134/S0040577922020064
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DOI: https://doi.org/10.1134/S0040577922020064