Lie monoid actions in Morse theory

Let G,G,H,HG,G',H,H' be compact Lie monoids, let X,XX,X' be closed smooth manifolds acted on by G×HG\times H and G×HG'\times H' respectively, let φ ⁣:GG\varphi\colon G\to G' and ψ ⁣:HH\psi\colon H\to H' be morphisms of Lie monoids, and let f ⁣:XXf\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.

Sources & referencesView supporting material

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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