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arXiv · 0906.0186

On Some Stratifications of Affine Deligne-Lusztig Varieties for SL_3

Boris Zbarsky
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Abstract

Let L be k((ε)), where k is an algebraic closure of a finite field with q elements and εis an indeterminate, and let σbe the Frobenius automorphism. Let G be a split connected reductive group over the fixed field of σin L, and let I be the Iwahori subgroup of G(L) associated to a given Borel subgroup of G. Let W be the extended affine Weyl group of G. Given x in W and b in G(L), we have some subgroup of G(L) that acts on the affine Deligne-Lusztig variety X_x(b) = {gI in G(L)/I : g^{-1}bσ(g) is in IxI} and hence a representation of this subgroup on the Borel-Moore homology of the variety. We investigate this representation for certain b in the cases when G is SL_2 and G is SL_3.

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BibTeXRIS

Boris Zbarsky. 2009-05-31. On Some Stratifications of Affine Deligne-Lusztig Varieties for SL_3. https://arxiv.org/abs/0906.0186

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