Generalized Bloch conjecture on support of zero-cycles

Let XX be a smooth projective complex variety and let mm be a nonnegative integer. Say that CH0(X)\operatorname{CH}_0(X) is supported on an mm-dimensional algebraic subset VXV\subset X when the pushforward map CH0(V)CH0(X)\operatorname{CH}_0(V)\to\operatorname{CH}_0(X) is surjective. Generalized Bloch conjecture. If

Hp,0(X)=0 for all p>m,H^{p,0}(X)=0\text{ for all }p>m,

then CH0(X)\operatorname{CH}_0(X) is supported on an mm-dimensional algebraic subset of XX. This generalizes Bloch's conjecture by replacing the condition that all positive-degree holomorphic forms vanish with vanishing above degree mm; the source presents it as the relevant generalization for the paper, without giving resolution evidence.

Sources & referencesView supporting material

Primary source

Kristin DeVleming and David Stapleton, “Maximal Chow constant and cohomologically constant fibrations”, arXiv:1909.01483 (2019).

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