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arXiv math/0211434math.RT
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确定某些仿射Deligne-Lusztig集是否为空

Determining whether certain affine Deligne-Lusztig sets are empty

Daniel C. Reuman

摘要:

设F是非阿基米德局部域,L是F的极大非分歧扩张,fr是F的弗罗贝尼乌斯自同构.设G是F上的可裂连通约化群,B(1)是G(F)的Bruhat-Tits建筑.我们知道fr作用在G(L)上,有不动点G(F).设I是与B(1)中的腔室相关联的Iwahori。我们有从G(L)/I × G(L)/I到G的扩张仿射外尔群W_e的相对位置映射inv。若w在W_e中,b在G(L)中,则仿射Deligne-Lusztig集Xw(bfr)为{x在G(L)/I中:inv(x,bfr(x))= w}.本文回答了对一定的G和b,Xw(bfr)有哪些非空的问题.

英文摘要:

Let F be a non-archimedean local field, let L be the maximal unramified extension of F, and let fr be the Frobenius automorphism. Let G be a split connected reductive group over F, and let B(1) be the Bruhat-Tits building associated to G(F). We know that fr acts on G(L) with fixed points G(F). Let I be the Iwahori associated to a chamber in B(1). We have the relative position map, inv, from G(L)/I x G(L)/I to the extended affine Weyl group, W_e of G. If w is in W_e and b is in G(L), then the affine Deligne-Lusztig set Xw(b fr) is {x in G(L)/I : inv(x,b fr(x)) = w}. This paper answers the question of which Xw(b fr) are non-empty for certain G and b.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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