The cohomological equation for Roth-type interval exchange maps
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- by S. Marmi, P. Moussa and J.-C. Yoccoz;
- J. Amer. Math. Soc. 18 (2005), 823-872
- DOI: https://doi.org/10.1090/S0894-0347-05-00490-X
- Published electronically: May 25, 2005
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Abstract:
We exhibit an explicit class of minimal interval exchange maps (i.e.m.’s) $T$ for which the cohomological equation \[ \Psi -\Psi \circ T=\Phi \] has a bounded solution $\Psi$ provided that the datum $\Phi$ belongs to a finite codimension subspace of the space of functions having on each interval a derivative of bounded variation. The proof is purely dynamical and is based on a renormalization argument and on Gottshalk-Hedlund’s theorem. If the datum is more regular the loss of differentiability in solving the cohomological equation will be the same. The class of interval exchange maps is characterized in terms of a diophantine condition of Roth type imposed to an acceleration of the Rauzy-Veech-Zorich continued fraction expansion associated to $T$. More precisely one must impose a growth rate condition for the matrices appearing in the continued fraction algorithm together with a spectral gap condition (which guarantees unique ergodicity) and a coherence condition. We also prove that the set of Roth-type interval exchange maps has full measure. In the appendices we construct concrete examples of Roth-type i.e.m.’s and we show how the growth rate condition alone does not imply unique ergodicity.References
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Bibliographic Information
- S. Marmi
- Affiliation: Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- MR Author ID: 120140
- P. Moussa
- Affiliation: Service de Physique Théorique, CEA/Saclay, 91191 Gif-Sur-Yvette, France
- J.-C. Yoccoz
- Affiliation: Collège de France, 3, Rue d’Ulm, 75005 Paris, France
- Received by editor(s): April 7, 2004
- Published electronically: May 25, 2005
- © Copyright 2005
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: J. Amer. Math. Soc. 18 (2005), 823-872
- MSC (2000): Primary 37A20; Secondary 11K50, 32G15, 37A45, 37E05
- DOI: https://doi.org/10.1090/S0894-0347-05-00490-X
- MathSciNet review: 2163864