Pierre Berger: Analytic pseudo-rotations
Tid: Ti 2023-04-25 kl 15.00 - 16.00
Plats: Institut Mittag-Leffler, Seminar Hall Kuskvillan and Zoom
Videolänk: Meeting ID: 921 756 1880
Medverkande: Pierre Berger, Institute of Mathematics of Jussieu
Abstract:
We construct analytic symplectomorphisms of the cylinder or the sphere with zero or exactly two periodic points and which are not conjugated to a rotation. In the case of the cylinder, we show that these symplectomorphisms can be chosen ergodic or to the contrary with local emergence of maximal order. In particular, this disproves a conjecture of Birkhoff (1941) and solve a problem of Herman (1998). One aspect of the proof provides a new approximation theorem, it enables in particular to implement the Anosov–Katok scheme in new analytic settings.