16 citations · 35 across the 14 of their papers we have counts for
4 papers · 1 filter
Unipotent morphisms
Daniel Bragg, Jack Hall, Siddharth Mathur
We introduce the theory of unipotent morphisms of algebraic stacks and prove a surprising local to global principle for a class of vector bundles. Two sample applications of our me…
Representability of cohomology of finite flat abelian group schemes
Daniel Bragg, Martin Olsson
We prove various finiteness and representability results for cohomology of finite flat abelian group schemes. In particular, we show that if …
Hodge numbers are not derived invariants in positive characteristic
Nicolas Addington, Daniel Bragg
We study a pair of Calabi-Yau threefolds X and M, fibered in non-principally polarized Abelian surfaces and their duals, and an equivalence D^b(X) = D^b(M), building on work of Gro…
Twisted Derived Equivalences and Isogenies between K3 Surfaces in Positive Characteristic
Daniel Bragg, Ziquan Yang
We study isogenies between K3 surfaces in positive characteristic. Our main result is a characterization of K3 surfaces isogenous to a given K3 surface in terms of certain inte…