Unboundedness of zero-cycles on higher dimensional Fano manifolds
Algebraic Geometry
2025-12-02 v1 Number Theory
Abstract
We show that, unlike del Pezzo surfaces, higher dimensional Fano manifolds do not satisfy in general boundedness properties for their group of -cycles. For example, for quartic threefolds having a point of odd degree, there is no ``Coray type" uperbound on the minimal odd degrees of points. Also, the -group of Fano hypersurfaces can be ``unbounded'' (a notion which is related to infinite dimensionality in the sense of Mumford), meaning that there is no integer such that -cycles of degree at least are effective.
Cite
@article{arxiv.2511.23080,
title = {Unboundedness of zero-cycles on higher dimensional Fano manifolds},
author = {Claire Voisin},
journal= {arXiv preprint arXiv:2511.23080},
year = {2025}
}