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Basic loci of Coxeter type with arbitrary parahoric level

Motivated by the desire to understand the geometry of the basic loci in the reduction of Shimura varieties, we study their "group-theoretic models" -- generalized affine Deligne-Lusztig varieties -- in cases where they have a particularly nice description. Continuing the work of [GH] and [GHN] we single out the class of cases of Coxeter type, give a characterization in terms of the dimension, and obtain a complete classification. We also discuss known, new and open cases from the point of view of Shimura varieties/Rapoport-Zink spaces.

preprint2020arXivOpen access
Ulrich GörtzXuhua HeSian Nie
math.AGmath.NT
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Ulrich GörtzXuhua HeSian Nie

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