Closure relations of Newton strata in Iwahori double cosets

Stefania Trentin, Eva Viehmann

Research output: Contribution to journalArticlepeer-review


We consider the Newton stratification on Iwahori double cosets for a connected reductive group. We prove the existence of Newton strata whose closures cannot be expressed as a union of strata, and show how this is implied by the existence of non-equidimensional affine Deligne–Lusztig varieties. We also give an explicit example for a group of type A4.

Original languageEnglish
Pages (from-to)35-48
Number of pages14
JournalManuscripta Mathematica
Issue number1-2
StatePublished - Jan 2023


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