Chevalley's restriction theorem for reductive symmetric superpairs
Chevalley's restriction theorem for reductive symmetric superpairs
复制标题
还原对称超对的 Chevalley 限制定理
DOI:
10.1016/j.jalgebra.2009.11.014
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发表时间:
2010
影响因子:
0.9
通讯作者:
M.R. Zirnbauer
中科院分区:
文献类型:
--
作者:
A. Alldridge;J. Hilgert;M.R. Zirnbauer
Let (g,k) be a reductive symmetric superpair of even type, i.e. so that there exists an even Cartan subspace a⊂p. The restriction map [Formula: see text] where W=W(g0:a) is the Weyl group, is injective. We determine its image explicitly. In particular, our theorem applies to the case of a symmetric superpair of group type, i.e.(k⊕k,k) with the flip involution where k is a classical Lie superalgebra with a non-degenerate invariant even form (equivalently, a finite-dimensional contragredient Lie superalgebra). Thus, we obtain a new proof of the generalisation of Chevalley's restriction theorem due to Sergeev and Kac, Gorelik. For general symmetric superpairs, the invariants exhibit a new and surprising behaviour. We illustrate this phenomenon by a detailed discussion in the example g=C(q+1)=osp(2|2q,C), endowed with a special involution. Here, the invariant algebra defines a singular algebraic curve.
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