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Actions of symplectic homeomorphisms/diffeomorphisms on foliations by curves in dimension 2

Part of: Finite-dimensional Hamiltonian, Lagrangian, contact, and nonholonomic systems Low-dimensional dynamical systems

Published online by Cambridge University Press:  20 January 2022

MARIE-CLAUDE ARNAUD  and
MAXIME ZAVIDOVIQUE
MARIE-CLAUDE ARNAUD*
Affiliation:
Université de Paris and Sorbonne Université, CNRS, IMJ-PRG, F-75013 Paris, France
MAXIME ZAVIDOVIQUE
Affiliation:
Sorbonne Université and Université de Paris, CNRS, IMJ-PRG, F-75005 Paris, France (e-mail: [email protected])
*
e-mail: [email protected]
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Abstract

The two main results in this paper concern the regularity of the invariant foliation of a $C^0$ -integrable symplectic twist diffeomorphism of the two-dimensional annulus, namely that (i) the generating function of such a foliation is $C^1$ , and (ii) the foliation is Hölder with exponent $\tfrac 12$ . We also characterize foliations by graphs that are straightenable via a symplectic homeomorphism and prove that every symplectic homeomorphism that leaves invariant all the leaves of a straightenable foliation has Arnol’d–Liouville coordinates, in which the dynamics restricted to the leaves is conjugate to a rotation. We deduce that every Lipschitz integrable symplectic twist diffeomorphisms of the two-dimensional annulus has Arnol’d–Liouville coordinates and then provide examples of ‘strange’ Lipschitz foliations by smooth curves that cannot be straightened by a symplectic homeomorphism and cannot be invariant by a symplectic twist diffeomorphism.

Keywords

twist mapssymplectic homeomorphismsgenerating functionsintegrability

MSC classification

Primary: 37E40: Twist maps
Secondary: 37E10: Maps of the circle 37J30: Obstructions to integrability (nonintegrability criteria)
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 43 , Issue 3 , March 2023 , pp. 794 - 826
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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