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

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

p23δ(p).\left\lfloor\sqrt[3]{\frac{p}{2}}\right\rfloor-\delta(p).

Logarithmic-gap conjecture. One has

lim suppp23δ(p)logp<.\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 logp\log p. The claim is motivated by computations for the ranges examined in the paper, but remains unproved.

Sources & referencesView supporting material

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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