Compatibility conjecture for quantization and reduction via adapted formality

Let MM be a Poisson manifold with a Lie algebra g\mathfrak{g}-action, let JJ be an equivariant momentum map, and let MredM_{\mathrm{red}} denote the reduced space. Let F ⁣:Tpoly(M)Dpoly(M)F\colon T_{\mathrm{poly}}(M)\to D_{\mathrm{poly}}(M) be a g\mathfrak{g}-adapted LL_\infty morphism, and let G ⁣:Tpoly(Mred)Dpoly(Mred)G\colon T_{\mathrm{poly}}(M_{\mathrm{red}})\to D_{\mathrm{poly}}(M_{\mathrm{red}}) be the LL_\infty-quasi-isomorphism obtained by the stated zig-zag, with both morphisms constructed using the same Drinfel'd associator. The associated twisted curved LL_\infty morphism is

FJg ⁣:(Tg(M)[[]],λ,[J,],[,]g)(Dg(M)[[]],λ,g[J,],[,]g).F^\mathfrak{g}_J\colon \big(T_\mathfrak{g}(M)[[\hbar]],\hbar\lambda,-[J,\cdot],[\cdot,\cdot]_\mathfrak{g}\big)\longrightarrow \big(D_\mathfrak{g}(M)[[\hbar]],\hbar\lambda,\partial_\mathfrak{g}-[J,\cdot],[\cdot,\cdot]_\mathfrak{g}\big).

The reduction maps TredT_{\mathrm{red}} and DredD_{\mathrm{red}} fit into a diagram with GG whose curved LL_\infty-morphism square commutes up to homotopy.

Compatibility conjecture. The diagram of curved LL_\infty-morphisms

(Tg(M)[[]],λ,[J,],[,]g)FJg(Dg(M)[[]],λ,g[J,],[,]g)TredDred(Tpoly(Mred)[[]],[,])G(Dpoly(Mred)[[]],,[,])\begin{CD} \big(T_\mathfrak{g}(M)[[\hbar]],\hbar\lambda,-[J,\cdot],[\cdot,\cdot]_\mathfrak{g}\big) @>{F^\mathfrak{g}_J}>> \big(D_\mathfrak{g}(M)[[\hbar]],\hbar\lambda,\partial_\mathfrak{g}-[J,\cdot],[\cdot,\cdot]_\mathfrak{g}\big)\\ @V{T_{\mathrm{red}}}VV @VV{D_{\mathrm{red}}}V\\ \big(T_{\mathrm{poly}}(M_{\mathrm{red}})[[\hbar]],[\cdot,\cdot]\big) @>>{G}> \big(D_{\mathrm{poly}}(M_{\mathrm{red}})[[\hbar]],\partial,[\cdot,\cdot]\big) \end{CD}

commutes up to homotopy.

Sources & referencesView supporting material

Primary source

Chiara Esposito, Ryszard Nest, Jonas Schnitzer and Boris Tsygan, “Quantization of the Momentum Map via g-adapted Formalities”, arXiv:2502.18295 (2025).

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