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On Mirror Symmetry and Irrationality of Zeta Values

Published 12 Mar 2024 in math.AG and hep-th | (2403.07349v2)

Abstract: A fundamental object of study in mirror symmetry of $n$-dimensional Fano varieties is the A-side connection on small quantum cohomology. When the Picard rank is 1, the Borel transform relates the quantum differential operator of the Fano to the Picard-Fuchs operator of the mirror to the associated pencil of anticanonical Calabi-Yau $(n-1)$-folds on the Fano variety. Expanding on related work by W. Yang on the Beukers-Peters pencil of K3 surfaces associated with Ap\'ery's proof for the irrationality of $\zeta(3)$, for such operators we define holomorphic prepotentials, virtual Yukawa couplings, and virtual instanton numbers, analogous to the usual ingredients of Calabi-Yau mirror symmetry. We prove that when the underlying Calabi-Yau operator is modular, the virtual Yukawa coupling is a modular form of weight-$(n+1)$, with the holomorphic prepotential as an Eichler integral. We then analyze the quantum differential operators for modular pencils of K3 surfaces arising as Dolgachev-Nikulin-Pinkham mirrors for the anticanonical linear systems for the 17 deformation classes of Fano threefolds of Picard rank-1 classified by Iskovskikh from the perspective of Golyshev & Zagier's proof of the Gamma conjecture for such Fanos, the natural setting of Yang's work. Here, the virtual instanton numbers are proven to be periodic integers with period equal to the level of the modular subgroup. Finally, we conjecture that the geometric nature of these virtual instanton numbers can be understood in terms of relative genus zero Gromov-Witten invariants of the associated log Calabi-Yau pair from the Fano threefold and anticanonical K3.

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