The twisted coalgebra conjecture for configuration-space models

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 Bι\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

Bι(ch(M+)ΩB(sLieE)(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))Bι(ch(M+)ΩB(sLieE)(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 ΩBEnu\operatorname{\Omega B}\mathcal{E}^{\mathrm{nu}}-coalgebras in right ΩB(LiedE)\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.

Sources & referencesView supporting material

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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