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$${SL(2, \mathbb{R})}$$ 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 :

RBID : ISTEX:FB9C7E13249C319AFF34B45AFF25FD1CA3DD281B

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


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