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arXiv · 2609.19744

Chow Vanishing and Motives of Cluster Varieties

Josephine Hlavinka
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Abstract

We prove that the integral Chow groups $CH^i$ and mixed Hodge degree $H^{2i, (i, i)}$ cohomology groups of really full rank (RFR) sink-recurrent cluster varieties vanish for $i > 0$. In particular this applies to braid varieties and open Richardson varieties in any Lie type. Our main tool is the construction of a stratification of any RFR sink-recurrent cluster variety $\mathcal{A}(Σ)$ into (affine spaces times) RFR sink-recurrent cluster varieties of seeds with fewer mutable vertices than $Σ$. We employ the theory of Voevodsky motives, and towards this end we prove that the cycle class maps are isomorphisms onto the lowest-weight part of rational Borel-Moore homology for any mixed Tate variety over a number field. We then show that RFR sink-recurrent cluster varieties have mixed Tate and, in fact, split motives. Finally, we use our results to deduce vanishing theorems about the Khovanov-Rozansky homology groups of closures of positive braids and generation properties of the cohomology of closed Richardson, projected Richardson, and brick varieties.

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Josephine Hlavinka. 2026-09-17. Chow Vanishing and Motives of Cluster Varieties. https://arxiv.org/abs/2609.19744

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