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Title: The integral Hodge conjecture for two-dimensional Calabi–Yau categories
We formulate a version of the integral Hodge conjecture for categories, prove the conjecture for two-dimensional Calabi–Yau categories which are suitably deformation equivalent to the derived category of a K3 or abelian surface, and use this to deduce cases of the usual integral Hodge conjecture for varieties. Along the way, we prove a version of the variational integral Hodge conjecture for families of two-dimensional Calabi–Yau categories, as well as a general smoothness result for relative moduli spaces of objects in such families. Our machinery also has applications to the structure of intermediate Jacobians, such as a criterion in terms of derived categories for when they split as a sum of Jacobians of curves.  more » « less
Award ID(s):
2112747 2002709 1902060
PAR ID:
10329185
Author(s) / Creator(s):
Date Published:
Journal Name:
Compositio Mathematica
Volume:
158
Issue:
2
ISSN:
0010-437X
Page Range / eLocation ID:
287 to 333
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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