Stable Chow groups conjecture for Hurwitz spaces

Let GG be a finite group, let c=c1ckGc=c_1\cup\cdots\cup c_k\subset G be a union of conjugacy classes, and let CHurn1,,nkG,c1,,ck\operatorname{CHur}^{G,c_1,\ldots,c_k}_{n_1,\ldots,n_k} be the Hurwitz space introduced above. Fix an integer ii. Suppose all n1,,nkn_1,\ldots,n_k are sufficiently large, with the required bound depending on ii.

Stable Chow groups conjecture. The iith rational Chow groups of CHurn1,,nkG,c1,,ck\operatorname{CHur}^{G,c_1,\ldots,c_k}_{n_1,\ldots,n_k} stabilize, in the sense that they are independent of n1,,nkn_1,\ldots,n_k. The stronger statement in the source asks whether, for every connected component ZZ of this Hurwitz space, the branch-locus map

Z\confn1,,nkZ\longrightarrow\conf_{n_1,\ldots,n_k}

induces an isomorphism on the iith rational Chow groups. This is a more ambitious analogue of the stable homology conjecture, and the source presents it as an open question.

Sources & referencesView supporting material

Primary source

Aaron Landesman and Ishan Levy, “The Cohen–Lenstra moments over function fields via the stable homology of non-splitting Hurwitz spaces”, arXiv:2410.22210 (2025).

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