Gamma conjecture for asymptotics of mirror Lagrangian periods

Let XX be a Calabi--Yau manifold equipped with a symplectic form ω\omega, and let {Zt}tΔ\{Z_t\}_{t\in \Delta^\ast} be a family of Calabi--Yau manifolds parametrized by tt in a small punctured disc Δ\Delta^\ast that corresponds to (X,ω)(X,\omega) under mirror symmetry. Let Ωt\Omega_t be a suitable holomorphic volume form on ZtZ_t, let tt be a suitable coordinate, and let CtZtC_t\subset Z_t be a Lagrangian cycle mirror to a coherent sheaf EE on XX. Gamma conjecture. As t0t\to 0 in a fixed angular sector, one should have

CtΩt=XtωΓ^X(2π1)deg/2ch(E)+O(tϵ),\int_{C_t} \Omega_t=\int_X t^{-\omega}\cdot \widehat{\Gamma}_X\cdot (2\pi\sqrt{-1})^{\deg/2}\operatorname{ch}(E)+O(t^\epsilon),

where ϵ>0\epsilon>0 is some constant. This conjectural asymptotic formula relates periods of Lagrangian cycles on the mirror family to the Gamma class and Chern character on the Calabi--Yau manifold, and is motivated by the mirror-symmetric correspondence between tropical or ordinary cycles and the Gamma conjecture. Its general validity remains open.

Sources & referencesView supporting material

Primary source

Yuto Yamamoto, “Lifts of cycles in tropical hypersurfaces and the Gamma conjecture”, arXiv:2602.08666 (2026).

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