Lie monoid actions in Morse theory

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Let G,G′,H,H′G,G',H,H' be compact Lie monoids, let X,X′X,X' be closed smooth manifolds acted on by G×HG\times H and G′×H′G'\times H' respectively, let φ ⁣:G→G′\varphi\colon G\to G' and ψ ⁣:H→H′\psi\colon H\to H' be morphisms of Lie monoids, and let f ⁣:X→X′f\colon X\to X' be (φ,ψ)(\varphi,\psi) bi-equivariant. Write CM(−)CM(-) for the corresponding Morse complexes. Lie monoid actions in Morse theory. The complexes CM(G),CM(G′),CM(H),CM(H′)CM(G),CM(G'),CM(H),CM(H') are f-bialgebras; CM(X),CM(X′)CM(X),CM(X') are uu-bimodules of f-bialgebras; φ\varphi and ψ\psi induce morphisms of f-bialgebras

φ∗ ⁣:CM(G)→CM(G′),ψ∗ ⁣:CM(H)→CM(H′);\varphi_*\colon CM(G)\to CM(G'),\qquad \psi_*\colon CM(H)\to CM(H');

and ff induces a (φ∗,ψ∗)(\varphi_*,\psi_*) bi-equivariant morphism of uu-bimodules

f∗ ⁣:CM(X)→CM(X′).f_*\colon CM(X)\to CM(X').

This is the proposed chain-level compatibility between Lie monoid actions and the multiplicative structures of Morse theory; the paper states that the relevant notions are developed in its algebraic framework and that a proof is planned in forthcoming work.

References

Primary source

Guillem Cazassus, Alexander Hock and Thibaut Mazuir, “Bialgebras, and Lie monoid actions in Morse and Floer theory, I”, arXiv:2410.16225 (2025).

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