Dirac cohomology for graded affine Hecke algebras
Dirac cohomology for graded affine Hecke algebras
复制标题
分级仿射赫克代数的狄拉克上同调
DOI:
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发表时间:
2010
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通讯作者:
Peter E. Trapa
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作者:
D. Barbasch;D. Ciubotaru;Peter E. Trapa
We define an analogue of the Casimir element for a graded affine Hecke algebra $$ \mathbb{H} $$, and then introduce an approximate square-root called the Dirac element. Using it, we define the Dirac cohomology HD (X) of an $$ \mathbb{H} $$-module X, and show that HD (X) carries a representation of a canonical double cover of the Weyl group $$ \widetilde{W} $$. Our main result shows that the $$ \widetilde{W} $$-structure on the Dirac cohomology of an irreducible $$ \mathbb{H} $$-module X determines the central character of X in a precise way. This can be interpreted as p-adic analogue of a conjecture of Vogan for Harish-Chandra modules. We also apply our results to the study of unitary representations of $$ \mathbb{H} $$.