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math.AG2026
Equivalued affine springer fibers in mixed characteristic
Jingren Chi
We study Witt-vector affine Springer fibers for tame equi-valued conjugacy classes in tamely ramified groups. Similar to the approach of Goresky-Kottwitz-MacPherson in the equal ch…
math.AG2024
Witt vector affine Springer fibers
Jingren Chi
We establish dimension formulas for the Witt vector affine Springer fibers associated to a reductive group over a mixed characteristic local field, under the assumption that the gr…
math.AG2018
Geometry of Kottwitz-Viehmann Varieties
Jingren Chi
We study basic geometric properties of Kottwitz-Viehmann varieties, which are certain generalizations of affine Springer fibers that encode orbital integrals of spherical Hecke fun…