Mathematics – Dynamical Systems
Scientific paper
2011-01-13
Mathematics
Dynamical Systems
3 figures
Scientific paper
The present paper concerns the dynamics of surface diffeomorphisms. Given a diffeomorphism $f$ of a surface $S$, the \emph{torsion} of the orbit of a point $z\in S$ is, roughly speaking, the average speed of rotation of the tangent vectors under the action of the derivative of $f$, along the orbit of $z$ under $f$. The purpose of the paper is to identify some situations where there exist measures and orbits with non-zero torsion. We prove that every area preserving diffeomorphism of the disc which coincides with the identity near the boundary has an orbit with non-zero torsion. We also prove that a diffeomorphism of the torus $\mathbb{T}^2$, isotopic to the identity, whose rotation set has non-empty interior, has an orbit with non-zero torsion.
Beguin Francois
Boubaker Zouhour Rezig
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