The point-count and Calabi-Yau resolution conjecture for V_{32}/G_4

Let V32V_{32} be the double cover considered in the paper, and let G4=α1,α2G_4=\langle\alpha_1,\alpha_2\rangle. Write [V32/G4]p[V_{32}/G_4]_p for the number of points of the quotient over Fp\mathbb F_p, and let a6,pa_{6,p} be the relevant Hecke eigenvalue in weight 66. A strongly rigid Calabi–Yau resolution is a strongly rigid resolution of singularities that is Calabi–Yau. Point-count and resolution conjecture for V32/G4V_{32}/G_4. For every prime p>2p>2,

[V32/G4]p=i=05pia6,p,[V_{32}/G_4]_p=\sum_{i=0}^5p^i-a_{6,p},

and V32/G4V_{32}/G_4 has a strongly rigid Calabi–Yau resolution. The point-count formula is suggested by computations for p<20p<20, while the existence of the asserted resolution remains unproved in the supplied context.

Sources & referencesView supporting material

Primary source

Adam Logan, “Modularity of two double covers of P^5 branched along 12 hyperplanes”, arXiv:1811.02739 (2021).

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