Chi-independence of the module structure for Betti stacks

Let r,dZr,d\in\mathbf{Z} with r>0r>0, and let AZ1(r,d)Betti\mathscr{A}_{\mathbf{Z}_{\geqslant1}\cdot(r,d)}^{\operatorname{Betti}} be the indicated Betti CoHA subalgebra object. Let Hlr\mathbb{H}_{lr} be the ring of tautological classes acting on the rank-lrlr component. Chi-independence conjecture for Betti module structures. For every l1l\geqslant1, the homogeneous component (AZ1(r,d)Betti)(lr,ld)(\mathscr{A}_{\mathbf{Z}_{\geqslant1}\cdot(r,d)}^{\operatorname{Betti}})_{(lr,ld)} is stable under the Hlr\mathbb{H}_{lr}-action. If dZd'\in\mathbf{Z} satisfies gcd(r,d)=gcd(r,d)\gcd(r,d)=\gcd(r,d'), then there is an isomorphism

H((AZ1(r,d)Betti)(lr,ld))H((AZ1(r,d)Betti)(lr,ld))\operatorname{H}^*((\mathscr{A}_{\mathbf{Z}_{\geqslant1}\cdot(r,d)}^{\operatorname{Betti}})_{(lr,ld)})\cong\operatorname{H}^*((\mathscr{A}_{\mathbf{Z}_{\geqslant1}\cdot(r,d)}^{\operatorname{Betti}})_{(lr,ld')})

of Hlr\mathbb{H}_{lr}-modules. This is posed as the Betti-side generalization of the module-compatibility proposition known under the coprimality condition.

Sources & referencesView supporting material

Primary source

Lucien Hennecart, “Nonabelian Hodge isomorphisms for stacks and cohomological Hall algebras”, arXiv:2307.09920 (2025).

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