The twisted coalgebra conjecture for configuration-space models

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Let MM be a simply connected parallelizable manifold of finite type and dimension dd. Let ch⁡(FMM)\operatorname{ch}(\mathsf{FM}_M) be the symmetric sequence of chains on the Fulton–MacPherson compactifications, let M+M^+ be the one-point compactification, let I\mathcal{I} be the unit operad, and let Tw⁡\operatorname{Tw} and B⁡ι\operatorname{B}_\iota denote the twist and bar constructions. The source provides a zig-zag of quasi-isomorphisms identifying ch⁡(FMM)\operatorname{ch}(\mathsf{FM}_M) aritywise with

B⁡ι(ch⁡∗(M+)⊗ΩB⁡(sLie⊗E)∘(sdI)).\operatorname{B}_\iota\bigl(\operatorname{ch}^*(M^+)\otimes\operatorname{\Omega B}(\mathsf{sLie}\otimes\mathcal{E})\circ(s^d\mathcal{I})\bigr).

Twisted coalgebra conjecture. This zig-zag can be promoted to a zig-zag of equivalences

Tw⁡(ch⁡(FMM))≃B⁡ι(ch⁡∗(M+)⊗ΩB⁡(sLie⊗E)∘(sdI)),\operatorname{Tw}(\operatorname{ch}(\mathsf{FM}_M))\simeq\operatorname{B}_\iota\bigl(\operatorname{ch}^*(M^+)\otimes\operatorname{\Omega B}(\mathsf{sLie}\otimes\mathcal{E})\circ(s^d\mathcal{I})\bigr),

of twisted ΩB⁡Enu\operatorname{\Omega B}\mathcal{E}^{\mathrm{nu}}-coalgebras in right ΩB⁡(Lied⊗E)\operatorname{\Omega B}(\mathsf{Lie}_d\otimes\mathcal{E})-modules.

The conjecture is motivated by the relation between configuration spaces and pp-adic homotopy types. The source notes that it holds in characteristic zero and gives supporting evidence from the dd-shifted Lie-module structure, but leaves the positive-characteristic assertion open.

References

Primary source

Najib Idrissi and Victor Roca i Lucio, “Homology of configuration spaces in positive characteristic via point-set constructions”, arXiv:2606.26802 (2026).

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