Hochschild cohomology and graded Hecke algebras
Hochschild cohomology and graded Hecke algebras
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Hochschild 上同调和分级 Hecke 代数
DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
S. Witherspoon
中科院分区:
文献类型:
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作者:
A. V. Shepler;S. Witherspoon
We develop and collect techniques for determining Hochschild cohomology of skew group algebras S(V)#G and apply our results to graded Hecke algebras. We discuss the explicit computation of certain types of invariants under centralizer subgroups, focusing on the infinite family of complex reflection groups G(r,p,n) to illustrate our ideas. Resulting formulas for Hochschild two-cocycles give information about deformations of S(V)#G and, in particular, about graded Hecke algebras. We expand the definition of a graded Hecke algebra to allow a nonfaithful action of G on V, and we show that there exist nontrivial graded Hecke algebras for G(r, 1, n), in contrast to the case of the natural reflection representation. We prove that one of these graded Hecke algebras is equivalent to an algebra that has appeared before in a different form.