The CRM-CNRS welcomes Richard Griffon for a long stay

Starting from February 1, 2026, and for six months, the CRM-CNRS welcomes Richard Griffon.

Richard GRIFFON

Lecturer, University of Clermont-Auvergne

02/01/2026 – 08/31/2026

Richard Griffon has been a lecturer at the University of Clermont Auvergne since January 2021. His work lies at the intersection of number theory and Diophantine geometry. It mainly focuses on the arithmetic of elliptic curves and abelian varieties over function fields, the asymptotic study of special values of their L-functions, in the spirit of the Brauer–Siegel theorem and its generalizations, as well as on isogenies between abelian varieties and their interactions with various notions of height. He defended his thesis in July 2016 at the University of Paris Diderot, under the supervision of Marc Hindry, on analogues of the Brauer–Siegel theorem for families of elliptic curves defined over function fields. After his thesis, he was a postdoctoral researcher at Universiteit Leiden, then at Universität Basel. He is notably a member of the GAEC (ANR) and PadLEfAn (ANR) projects, and of the international network IRN GandA (CNRS).

In his work, he established an unconditional analogue of the Brauer–Siegel theorem for several families of (super)elliptic curves, notably Legendre curves and Hessian curves, as well as superelliptic curves over a function field, and for the family of Fermat surfaces over a finite field, by making explicit the associated L-functions and analyzing the fine distribution properties of their zeros. In collaboration with Le Fourn and Pazuki, he obtained results on the variation of differential height in the isogeny classes of abelian varieties over a function field and an optimal isogeny theorem for elliptic curves in this context.