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The integral Hodge conjecture for two-dimensional Calabi-Yau categories

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arxiv 2004.03163 v3 pith:3FWZJKKZ submitted 2020-04-07 math.AG

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keywords categoriesconjecturehodgeintegralcalabi-yautwo-dimensionalderivedfamilies
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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.

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  1. A note on geometry of Bridgeland Moduli spaces on Gushel-Mukai threefolds

    math.AG 2026-08 conditional novelty 6.0 of 10

    For general Gushel-Mukai threefolds, Bridgeland moduli spaces on the Kuznetsov component are normal, and for primitive numerical classes of odd square they are irreducible.

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