On central leaves of Hodge-type Shimura varieties with parahoric level structure

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Abstract

Kisin and Pappas [KP15] constructed integral models of Hodge-type Shimura varieties with parahoric level structure at p > 2, such that the formal neighbourhood of a mod p point can be interpreted as a deformation space of p-divisible group with some Tate cycles (generalising Faltings’ construction). In this paper, we study the central leaf and the closed Newton stratum in the formal neighbourhoods of mod p points of Kisin-Pappas integral models with parahoric level structure; namely, we obtain the dimension of central leaves and the almost product structure of Newton strata. In the case of hyperspecial level strucure (i.e., in the good reduction case), our main results were already obtained by Hamacher [Ham16a], and the result of this paper holds for ramified groups as well.
Original languageEnglish
Number of pages33
JournalMATHEMATISCHE ZEITSCHRIFT
Early online date29 Jun 2018
DOIs
Publication statusE-pub ahead of print - 29 Jun 2018

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