Stable Chow groups conjecture for Hurwitz spaces

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Let GG be a finite group, let c=c1∪⋯∪ck⊂Gc=c_1\cup\cdots\cup c_k\subset G be a union of conjugacy classes, and let CHur⁡n1,…,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 CHur⁡n1,…,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.

References

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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