Download e-book for kindle: Affine Flag Manifolds and Principal Bundles by Alexander Schmitt

By Alexander Schmitt

ISBN-10: 3034602871

ISBN-13: 9783034602877

ISBN-10: 303460288X

ISBN-13: 9783034602884

Affine flag manifolds are endless dimensional types of universal gadgets comparable to Gra?mann kinds. The publication gains lecture notes, survey articles, and examine notes - in response to workshops held in Berlin, Essen, and Madrid - explaining the importance of those and comparable items (such as double affine Hecke algebras and affine Springer fibers) in illustration conception (e.g., the idea of symmetric polynomials), mathematics geometry (e.g., the elemental lemma within the Langlands program), and algebraic geometry (e.g., affine flag manifolds as parameter areas for primary bundles). Novel facets of the idea of critical bundles on algebraic types also are studied within the publication.

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Extra resources for Affine Flag Manifolds and Principal Bundles

Example text

One can obviously generalize the definition to cover other parahoric subgroups of G(L). One obtains affine Deligne–Lusztig varieties inside (partial) affine flag varieties. We will consider the case of the Iwahori subgroup in detail in the following section. There is a p-adic variant, where L is replaced by the completion of the maximal unramified extension of Qp . In this case, the same definition gives an affine Deligne–Lusztig set. Although one still uses the term affine Deligne– Lusztig variety in the p-adic situation, this is not really justified.

Since for each x ∈ W we have a unique basic σ-conjugacy class in the same connected component as x, there is a unique basic σ-conjugacy class for which Xx (b) can possibly be non-empty. Therefore, as long as we talk only about basic σ-conjugacy classes, x practically determines b, and below we sometimes assume implicitly that x and b are in the same connected component of G(L). 21. Let us discuss the case of G = SL2 , b = 1. For SL2 , the situation is particularly simple. For instance, every element in the affine Weyl group of SL2 has a unique reduced expression, and there are only two elements of any given length > 0.

Furthermore, in favorable situations, for instance if the cohomology is pure, the usual cohomology can easily be recovered from the equivariant one. We sketch the definition of equivariant cohomology in the -adic setting. Though elegant, it is not easy to digest because it uses -adic cohomology of algebraic stacks. As long as one works over the field of complex numbers, one can also use the classical topological version of equivariant cohomology, see [30] and Tymoczko’s introductory paper [76]. The reference we follow in the -adic setting is the paper [15] by Chaudouard and Laumon.

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Affine Flag Manifolds and Principal Bundles by Alexander Schmitt

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