The Gamma-conjecture III on exponential-type quantum connections

Let XX be a smooth projective variety, let τH(X)\tau\in H^*(X) be a point where the quantum connection is of exponential type, and let C\mathsf{C} index the exponential factors. Let Vu\mathcal{V}_u be the summands of the sectorial decomposition of flat sections, and let s\mathfrak{s} be the Gamma-integral-structure map. Gamma-conjecture III. There exists a decomposition

K(X)=uCVuϕK(X)=\bigoplus_{u\in\mathsf{C}}V_u^\phi

such that Vu=s(Vuϕ)C\mathcal{V}_u=\mathfrak{s}(V_u^\phi)\otimes\mathbb{C}, with the lift ϕ\phi determining the sector and with Vuϕ+2π=VuϕωX[n]V_u^{\phi+2\pi}=V_u^\phi\otimes\omega_X[n]. This conjecture lifts the sectorial semiorthogonal decomposition from flat sections to the topological KK-group lattice. In the semisimple case, the source notes that each lattice is expected to be isomorphic to Z\mathbb{Z} and that its Euler form is unimodular; Gamma-conjecture II adds the stronger self-pairing condition 11.

Sources & referencesView supporting material

Primary source

Hiroshi Iritani, “Gamma classes and quantum cohomology”, arXiv:2307.15938 (2023).

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