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Ergodic properties of isoperimetric domains in spheres

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  • Let $\varphi$ be a function on the unit tangent bundle of a compact manifold of negative curvature. We show that averages of $\varphi$ over subdomains of increasing spheres converge to the horospherical mean if these domains satisfy an isoperimetric condition. We apply this result to spherical means with continuous density and, by using relations between the horospherical mean and the Patterson-Sullivan measure, we derive some kind of mixing properties.
    Mathematics Subject Classification: Primary 37C40, Secondary 53C12, 37C10.


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