The Gamma Conjecture for local mirror symmetry

Let XX be the noncompact toric variety considered in the paper, with K-groups K(X)K(X) and Kc(X)K^c(X) paired by

F,S=Xch(S)ch(F)ToddX.\langle F,S\rangle=\int_X\operatorname{ch}(S)\operatorname{ch}(F)\operatorname{Todd}_X.

Choose bases {F1,,Fd}\{F_1,\ldots,F_d\} of K(X)K(X) and {S1,,Sd}\{S_1,\ldots,S_d\} of Kc(X)K^c(X) satisfying Fi,Sj=δij\langle F_i,S_j\rangle=\delta_{ij}. Let ww be the cohomology-valued hypergeometric series defined in the paper, let ch(Fk)\operatorname{ch}(F_k) be the corresponding basis of Hceven(X)H_c^{\mathrm{even}}(X), and let mir(Sk)mir(S_k) denote the mirror of SkS_k under homological mirror symmetry. The Gamma Conjecture for local mirror symmetry. The expansion of ww satisfies

w(t1,,tpn,[D~n+1]2π1,,[D~p]2π1)=(12π1)n+1k=1d((mir(Sk)ΩYt)ch(Fk)),w\left(t_1,\ldots,t_{p-n},\frac{[\widetilde D_{n+1}]}{2\pi\sqrt{-1}},\ldots,\frac{[\widetilde D_p]}{2\pi\sqrt{-1}}\right)=\left(\frac{1}{2\pi\sqrt{-1}}\right)^{n+1}\sum_{k=1}^d\left(\left(\int_{mir(S_k)}\Omega_{Y^t}\right)\operatorname{ch}(F_k)\right),

where ΩYt\Omega_{Y^t} is the holomorphic form on the mirror. Equivalently, for every mirror pair (E,mir(E))(E,mir(E)), the central charges match:

Zt(E)=Ct(mir(E)).Z_t(E)=C_t(mir(E)).

This is the local-mirror-symmetry form of the Gamma conjecture: the hypergeometric-series expression for the central charge on the coherent-sheaf side should agree with the oscillatory period on the mirror side. The supplied text does not state whether this conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Junxiao Wang, “The Gamma Conjecture for Tropical Curves in Local Mirror Symmetry”, arXiv:2011.01729 (2022).

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