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Diophantine interval exchange maps

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Speaker: 
Stefano Marmi
Affiliation: 
Scuola Normale Superiore, Pisa
Date: 
Wed, 2018-07-04 10:00 - 10:50
Location: 
MPIM Lecture Hall

I will review results concerning the dynamics of (generalized) interval exchange maps obtained in collaboration with Moussa and Yoccoz and with Forni and Matheus. I will explain what part of the theory of circle diffeomorphisms extends to interval exchange maps: how to generalize the notion of rotation number and how the diophantine conditions needed to solve the cohomological equation and to prove a linearization theorem relate to the (unavoidable) loss of differentiability
which characterizes these "small divisor" problems.

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