Logarithmic upper-bound conjecture for the gap in minimal isogeny degrees

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Let δ(p)\delta(p) be the value associated with a prime pp. The observed gap is

⌊p23⌋−δ(p).\left\lfloor\sqrt[3]{\frac{p}{2}}\right\rfloor-\delta(p).

Logarithmic-gap conjecture. One has

lim sup⁡p→∞⌊p23⌋−δ(p)log⁡p<∞.\limsup_{p\to\infty}\frac{\left\lfloor\sqrt[3]{\frac{p}{2}}\right\rfloor-\delta(p)}{\log p}<\infty.

This predicts that the gap grows at most on the order of log⁡p\log p. The claim is motivated by computations for the ranges examined in the paper, but remains unproved.

References

Primary source

Yves Aubry, Roger Oyono and Christelle Vincent, “Minimal degree of an isogeny between a supersingular elliptic curve and its conjugate”, arXiv:2607.14624 (2026).

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