$${SL(2, \mathbb{R})}$$ S L ( 2 , R ) -invariant probability measures on the moduli spaces of translation surfaces are regular
Identifieur interne : 000036 ( Main/Exploration ); précédent : 000035; suivant : 000037$${SL(2, \mathbb{R})}$$ S L ( 2 , R ) -invariant probability measures on the moduli spaces of translation surfaces are regular
Auteurs : Artur Avila [France, Brésil] ; Carlos Matheus [France] ; Jean-Christophe Yoccoz [France]Source :
- Geometric and Functional Analysis [ 1016-443X ] ; 2013-12-01.
Abstract
Abstract: In the moduli space $${{\mathcal {H}}_g}$$ H g of normalized translation surfaces of genus g, consider, for a small parameter ρ > 0, those translation surfaces which have two non-parallel saddle-connections of length ⩽ ρ. We prove that this subset of $${{\mathcal {H}}_g}$$ H g has measure o(ρ 2) w.r.t. any probability measure on $${{\mathcal {H}}_g}$$ H g which is invariant under the natural action of $${SL(2,\mathbb{R})}$$ S L ( 2 , R ) . This implies that any such probability measure is regular, a property which is important in relation with the recent fundamental work of Eskin–Kontsevich–Zorich on the Lyapunov exponents of the KZ-cocycle.
Url:
DOI: 10.1007/s00039-013-0244-5
Affiliations:
- Brésil, France
- État de Rio de Janeiro, Île-de-France
- Paris, Rio de Janeiro, Villetaneuse
- Université Paris 13
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<front><div type="abstract" xml:lang="en">Abstract: In the moduli space $${{\mathcal {H}}_g}$$ H g of normalized translation surfaces of genus g, consider, for a small parameter ρ > 0, those translation surfaces which have two non-parallel saddle-connections of length ⩽ ρ. We prove that this subset of $${{\mathcal {H}}_g}$$ H g has measure o(ρ 2) w.r.t. any probability measure on $${{\mathcal {H}}_g}$$ H g which is invariant under the natural action of $${SL(2,\mathbb{R})}$$ S L ( 2 , R ) . This implies that any such probability measure is regular, a property which is important in relation with the recent fundamental work of Eskin–Kontsevich–Zorich on the Lyapunov exponents of the KZ-cocycle.</div>
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