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arxiv: 1303.0115 · v2 · pith:NLFKT5ZKnew · submitted 2013-03-01 · 🧮 math.AG · math.NT

Bruhat strata for Shimura varieties of PEL type

classification 🧮 math.AG math.NT
keywords bruhatstratastratificationclosureshimurastratumtypevarieties
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The Bruhat stratification for Shimura varieties of PEL type is studied. In the Siegel case this stratification is a scheme-theoretic variant of the stratification by the a-number. We show that all Bruhat strata are smooth and determine their dimensions. We also prove that the closure of a Bruhat stratum is a union of Bruhat strata and describe which Bruhat strata are contained in the closure of a given Bruhat stratum.

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