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math.AG2026
Finiteness of formal pushforwards
David Harbater, Julia Hartmann, Daniel Krashen
Under mild hypotheses, given a scheme and an open subset whose complement has codimension at least two, the pushforward of a torsion-free coherent sheaf on is coherent…
math.AG2025
A Looming of phantoms
Kimoi Kemboi, Daniel Krashen, Tianle Liu +6
Following Krah's method, we construct new examples of phantom categories as semiorthogonal components of the derived categories of two types of rational surfaces: the blowup of the…
math.AG2025
The Clifford algebra of a finite morphism
Daniel Krashen, Max Lieblich
We develop a general theory of Clifford algebras for finite morphisms of schemes and describe applications to the theory of Ulrich bundles and connections to period-index problems…