Ruprecht-Karls-Universität Heidelberg
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„Specialization for the pro-étale fundamental group and fundamental groups in rigid geometry “
Dr. Marcin Lara, Universität Krakau

The specialization morphism for the étale fundamental groups of Grothendieck cannot be generalized word-for-word to the more general pro-\'etale fundamental group of Bhatt and Scholze. It turns out, that one can deal with this problem by applying a rigid-geometric point of view: for a formal scheme X of finite type over a complete rank one valuation ring, we construct a specialization morphism from the de Jong fundamental group of the rigid generic fiber to the pro-étale fundamental group of the special fiber. The construction relies on an interplay between admissible blowups of X and normalizations of the irreducible components of X_k, and employs the Berthelot tubes of these irreducible components in an essential way. I will also mention a generalization of the de Jong's fundamental group. It is defined using a notion of "geometric arcs" in rigid geometry, enjoys many good properties of the pro-étale fundamental group and allows to answer some old questions of de Jong. This is a joint work with Piotr Achinger and Alex Youcis.

Freitag, den 12. November 2021 um 13:30 Uhr, in INF205, SR A Freitag, den 12. November 2021 at 13:30, in INF205, SR A

Der Vortrag folgt der Einladung von The lecture takes place at invitation by Prof. Dr. Alexander Schmidt