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Centralizers of nilpotent elements in basic classical Lie superalgebras in good characteristic

Published 24 Oct 2022 in math.RT | (2210.13155v1)

Abstract: Let \mathfrak{g}=\mathfrak{g}{\bar{0}}\oplus\mathfrak{g}{\bar{1}} be a basic classical Lie superalgebra over an algebraically closed field \mathbb{K} whose characteristic p>0 is a good prime for \mathfrak{g}. Let G_{\bar{0}} be the reductive algebraic group over \mathbb{K} such that \mathrm{Lie}(G_{\bar{0}})=\mathfrak{g}{\bar{0}}. Suppose e\in\mathfrak{g}{\bar{0}} is nilpotent. Write \mathfrak{g}{e} for the centralizer of e in \mathfrak{g} and \mathfrak{z}(\mathfrak{g}{e}) for the centre of \mathfrak{g}{e}. We calculate a basis for \mathfrak{g}{e} and \mathfrak{z}(\mathfrak{g}{e}) by using associated cocharacters \tau:\mathbb{K}{\times}\rightarrow G_{\bar{0}} of e. In addition, we give the classification of e which are reachable, strongly reachable or satisfy the Panyushev property for exceptional Lie superalgebras D(2,1;\alpha), G(3) and F(4).

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