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math.AG2024
Hodge-Chern classes and strata-effectivity in tautological rings
Simon Cooper, Wushi Goldring
Given a connected, reductive -group , a cocharacter and a smooth zip period map $ζ:X \to \mathop{\text{$G$-{\tt Zip}}}\nolimits^μ$, we study which cl…
math.AG2024
An Ogus Principle for Zip period maps: The Hasse invariant's vanishing order via `Frobenius and the Hodge filtration'
Wushi Goldring, Stefan Reppen
This paper generalizes a result of Ogus that, under certain technical conditions, the vanishing order of the Hasse invariant of a family of -dimensional Calabi-Yau varieti…