The arithmetic point-count conjecture for Berglund–Hübsch Calabi–Yau orbifolds

Let AA be an n×nn\times n Berglund–Hübsch matrix over Fp\mathbb F_p, with n3n\ge 3, and let GG be a subgroup of GAG_A such that JGGTJ\in G\cap G^T. Assume

JATJT=1.JA^{-T}J^T=1.

Let XAX_A be the hypersurface in the weighted projective space over Fp\mathbb F_p with weights wi=m(JAT)iw_i=m(JA^{-T})_i, where mm is the smallest integer such that each wiw_i is an integer, cut out by WA(x)=0W_A(x)=0. Let YA,GY_{A,G} be the orbifold [XA/J][X_A/\langle J\rangle], and let ZA,G(Fp)Z_{A,G}(\mathbb F_p) be any crepant resolution of YA,G(Fp)Y_{A,G}(\mathbb F_p). Arithmetic point-count conjecture. The number of points of ZA,G(Fp)Z_{A,G}(\mathbb F_p) is equal to STp(A,G){\rm ST}_p(A,G).

This conjecture predicts that the point count of a crepant resolution of the Berglund–Hübsch orbifold is governed by the corresponding stringy trace. The supplied text does not state whether the conjecture is known or remains open.

Sources & referencesView supporting material

Primary source

Marco Aldi and Andrija Perunicic, “Invertible Calabi-Yau Orbifolds over Finite Fields”, arXiv:2504.16716 (2026).

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