Dubrovin's refined conjecture for Fano varieties

From papers

Let XX be a Fano variety of complex dimension DD with odd-vanishing cohomology, and let F0(v)F_0(\textbf{v}) be a power series with convergence domain Ω\Omega. Let Db(X)\mathcal{D}^b(X) denote the bounded derived category of coherent sheaves on XX, and let χ(Ej,Ek)\chi(E_j,E_k) be the Euler pairing of objects in this category. Write YRY_R for the relevant solution and Ytop=ΨYtopY_{\rm top}=\Psi\cdot\mathcal{Y}_{\rm top} for the topological-enumerative solution. Let Γ^X\widehat\Gamma^-_X be the negative Gamma class, let c1(X)c_1(X) be the first Chern class, and put Dˉ=D mod 2\bar D=D\ \text{mod}\ 2. Dubrovin's refined conjecture. The quantum cohomology of XX is semisimple if and only if Db(X)\mathcal{D}^b(X) admits a full exceptional collection. If the quantum cohomology of XX is semisimple, then there exists a full exceptional collection (E1,,En)(E_1,\dots,E_n) such that the Stokes matrix SS is the inverse of the Euler matrix (χ(Ej,Ek))1j,kn\left(\chi(E_j,E_k)\right)_{1\leq j,k\leq n}, and the central connection matrix CC connecting YRY_R with YtopY_{\rm top} is the matrix whose columns are the coordinates of

iDˉ(2π)D2Γ^Xexp(πic1(X))Ch(Ek),1kn.\frac{i^{\bar D}}{(2\pi)^\frac{D}{2}}\widehat\Gamma^-_X\cup\exp(-\pi i c_1(X))\cup{\rm Ch}(E_k),\qquad 1\leq k\leq n.

This refines Dubrovin's original conjecture by specifying the central connection matrix through Gamma classes and Chern characters. The paper proves the conjecture for the Lagrangian Grassmannian LG(2,4)LG(2,4), while the general statement remains open.

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Sources & referencesView supporting material

Primary source

Fangze Sheng, “Proof of the refined Dubrovin conjecture for the Lagrangian Grassmanian LG(2,4)”, arXiv:2409.03590 (2024).

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