The Kapranov potential conjecture for smooth symplectic schemes

Let (X,ω)(X,\omega) be a smooth symplectic scheme. Kapranov's cyclic LL_\infty structure on TX[1]\mathrm{T}_X[-1] has a potential in Γ(X,Sym^3(TX))\Gamma(X,\widehat{\operatorname{Sym}}^{\geq 3}(\mathrm{T}_X)) of cohomological degree 11. Kapranov's potential conjecture. The (1)(-1)-shifted Poisson structure on XX obtained as the image of ω\omega under the forgetful map

Pois(X,0)Pois(X,1)\operatorname{Pois}(X,0)\longrightarrow \operatorname{Pois}(X,-1)

gives the potential for this cyclic LL_\infty structure. The claim identifies the shifted Poisson structure naturally induced by the symplectic form with Kapranov's potential; the accompanying discussion notes that its underlying bivector is trivial because the diagonal is Lagrangian with split normal bundle.

Sources & referencesView supporting material

Primary source

Pavel Safronov, “Lectures on shifted Poisson geometry”, arXiv:1709.07698 (2017).

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