Cohomologie de de Rham du rev\^etement mod\'er\'e de la tour de Lubin-Tate

TL;DR

This paper investigates the De Rham cohomology of the first Lubin-Tate tower cover, providing a local proof that connects supercuspidal representations with the local Jacquet-Langlands correspondence via comparison with Deligne-Lusztig varieties.

Contribution

It offers a purely local proof of the realization of the local Jacquet-Langlands correspondence in the De Rham cohomology of Lubin-Tate towers, extending previous methods with explicit semi-stable models.

Findings

Supercuspidal part matches the local Jacquet-Langlands correspondence.

Comparison with rigid cohomology of Deligne-Lusztig varieties.

Explicit semi-stable model constructed for the tower.

Abstract

In this article, we study the De Rham cohomology of the first cover in the Lubin-Tate tower. In particular, we get a purely local proof that the supercuspidal part realizes the local Jacquet-Langlands correspondence for ${\rm GL}_n$ by comparing it to the rigid cohomology of some Deligne-Lusztig varieties. The representations obtained are analogous to the ones appearing in the $\ell$-adic cohomology if we forget the action of the Weil group. The proof relies on the generalization of an excision result of Grosse-Kl\"onne and on the existence of a semi-stable model constructed by Yoshida for which we give a more explicit description.