The conjecture on equality of F-pure and log canonical thresholds for ideals

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Let a\mathfrak{a} be an ideal in Q[x1,…,xm]\mathbb{Q}[x_1,\ldots,x_m], and let ap=a⋅Fp[x1,…,xm](x1,…,xm)\mathfrak{a}_p=\mathfrak{a}\cdot\mathbb{F}_p[x_1,\ldots,x_m]_{(x_1,\ldots,x_m)} be its reduction modulo a prime pp. Write fpt⁡(ap)\operatorname{fpt}(\mathfrak{a}_p) for the FF-pure threshold of ap\mathfrak{a}_p at the origin and lct⁡(a)\operatorname{lct}(\mathfrak{a}) for the log canonical threshold of a\mathfrak{a} at the origin.

Threshold-equality conjecture. There are infinitely many primes pp for which

fpt⁡(ap)=lct⁡(a).\operatorname{fpt}(\mathfrak{a}_p)=\operatorname{lct}(\mathfrak{a}).

For sufficiently large pp, one has fpt⁡(ap)≤lct⁡(a)\operatorname{fpt}(\mathfrak{a}_p)\leq\operatorname{lct}(\mathfrak{a}) and the FF-pure thresholds converge to the log canonical threshold. The conjecture asks whether equality holds for infinitely many primes; it remains an open challenge, although cases are known.

References

Primary source

Wágner Badilla-Céspedes and Edwin León-Cardenal, “F-pure thresholds and F-Volumes of some non principal ideals”, arXiv:2305.00571 (2024).

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