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Séminaire de Théorie des Nombres

Resolution of wild $Z/pZ$-quotient singularities

Dino Lorenzini

( (UGA) )

Salle de conférences

le 17 mai 2024 à 14:00

The regular model of a curve is a key object in the study of the arithmetic of the curve, as information about the special fiber of a regular model provides information about its generic fiber (such as rational points through the Chabauty-Coleman method, index, Tamagawa number of the Jacobian, etc). Every curve has a somewhat canonical regular model obtained from the quotient of a regular semistable model by resolving only singularities of a special type called quotient singularities. We will discuss in this talk what is known about the resolution graphs of Z/pZZ/pZ-quotient singularities in the wild case, when pp is also the residue characteristic. The possible singularities that can arise in this process are not yet completely understood, even in the case of elliptic curves in residue characteristic 2.