Abstract
A theorem of Esnault, Srinivas and Viehweg asserts that if the Chow group of 0-cycles of a smooth complete complex variety decomposes, then the top-degree coherent cohomology group decomposes similarly. In this note, we prove that (a weak version of) the converse holds for varieties of dimension at most 5 that have finite-dimensional motive and satisfy the Lefschetz standard conjecture. The proof is based on Vial’s construction of a refined Chow–Künneth decomposition for these varieties.
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Notes
It is somewhat frustrating that it is not known unconditionally whether (P1) implies (P2), i.e. without assuming the generalized Hodge conjecture. Apparently Esnault, Srinivas and Viehweg had claimed to prove this in an earlier version of their paper, but the argument was found to be incomplete (Esnault et al. 1993, remark 2).
To be precise, Nori’s result is more general, as the notion of k-decomposability in Esnault et al. (1993) is broader than the notion discussed here: in loc. cit., an element \(a\in A^nV\) is defined to be k-decomposable if it can be written as \(a=\sum _{j=1}^k a_j\cdot b_j\) with \(a_j\cdot b_j\) homogeneous of degree n.
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Acknowledgments
This note was stimulated by the Strasbourg 2014–2015 “groupe de travail” based on the monograph Voisin (2014). I want to thank all the participants of this groupe de travail for the very pleasant and stimulating atmosphere, and their interesting lectures. Thanks to Charles Vial and the referee for helpful comments. Many thanks to Yasuyo, Kai and Len for providing excellent working conditions at home in Schiltigheim.
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Laterveer, R. On a multiplicative version of Bloch’s conjecture. Beitr Algebra Geom 57, 723–734 (2016). https://doi.org/10.1007/s13366-016-0296-4
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DOI: https://doi.org/10.1007/s13366-016-0296-4
Keywords
- Algebraic cycles
- Chow groups
- Intersection product
- Finite-dimensional motives
- Bloch–Beilinson conjectures