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Séminaire Géométrie et groupes discrets

Balls in Teichmüller space are not convex

by Prof. Kasra RAFI (Université de Toronto)

lundi 6 février 2017 de au (Europe/Paris)
at IHES ( Amphithéâtre Léon Motchane )
Le Bois-Marie 35, route de Chartres 91440 Bures-sur-Yvette
Description

We prove that when 3g − 3 + p > 3, the Teichmüller space of the closed surface of genus g with p punctures contains balls which are not convex in the Teichmüller metric. We analyze the quadratic differential associated to a Teichmüller geodesic and, as a key step, show that the extremal length of a curve (as a function of time) can have a local maximum. This is a joint work with Maxime Fortier Bourque.

Organisé par Fanny Kassel
Contact Email: cecile@ihes.fr