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arXiv 0903.3744math.RTmath.CO
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通过仿射建筑的MV-多面体

MV-Polytopes via affine buildings

Michael Ehrig

摘要:

利用Bott-Samelson簇的几何和仿射构造给出了复半单代数群G的MV-多面体的一个构造.这是通过使用Gaussent和Littelmann的MV-圈的稠密子集的构造来完成的。他们使用LS-图库来定义Bott-Samelson簇中的子集,这些子集映射到仿射格拉斯曼的子集,其闭包是MV-圈。由于点在Bott-Samelson品种对应的画廊在仿射建筑物可以看看图像的一个点在这样一个特殊的子集下的所有撤回在无穷远。我们证明,这些图像可以用来构建相应的MV-多面体在一个明确的方式,通过使用GGMS地层。利用LS-画廊的晶体结构和普通外尔群在余权格上的作用,给出了这些图像的组合构造.

英文摘要:

We give a construction of MV-polytopes of a complex semisimple algebraic group G in terms of the geometry of the Bott-Samelson variety and the affine building. This is done by using the construction of dense subsets of MV-cycles by Gaussent and Littelmann. They used LS-gallery to define subsets in the Bott-Samelson variety that map to subsets of the affine Grassmannian, whose closure are MV-cycles. Since points in the Bott-Samelson variety correspond to galleries in the affine building one can look at the image of a point in such a special subset under all retractions at infinity. We prove that these images can be used to construct the corresponding MV-polytope in an explicit way, by using the GGMS strata. Furthermore we give a combinatorial construction for these images by using the crystal structure of LS-galleries and the action of the ordinary Weyl group on the coweight lattice.

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