HLS conjecture for Heegner divisors of Coble type quartics

Let d4a42d4a4_2, d4a46d4a4_6, d4a48d4a4_8, and d4a4dd4a4_d for de516de5 16 denote the indicated Heegner divisors, and call a Heegner divisor HLS if it has the HLS property used in the paper. HLS conjecture. The Heegner divisors d4a42d4a4_2, d4a46d4a4_6, and d4a48d4a4_8 are also HLS divisors, whereas the Heegner divisors d4a4dd4a4_d for de516de5 16 are not HLS. The first assertion is expected to follow from the examples discussed in the paper, while the second is supported by a special example; the claims remain conjectural.

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Primary source

Benedetta Piroddi, Ángel David Ríos Ortiz, Andrés Rojas and Jieao Song, “Coble type hypersurfaces and hyperkähler fourfolds”, arXiv:2606.10884 (2026).

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