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Counting common perpendicular arcs in negative curvature

Published online by Cambridge University Press:  28 January 2016

JOUNI PARKKONEN
Affiliation:
Department of Mathematics and Statistics, PO Box 35, 40014 University of Jyväskylä, Finland email jouni.t.parkkonen@jyu.fi
FRÉDÉRIC PAULIN
Affiliation:
Département de mathématique, UMR 8628 CNRS, Bât. 425, Université Paris-Sud, 91405 ORSAY Cedex, France email frederic.paulin@math.u-psud.fr
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Abstract

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Let $D^{-}$ and $D^{+}$ be properly immersed closed locally convex subsets of a Riemannian manifold with pinched negative sectional curvature. Using mixing properties of the geodesic flow, we give an asymptotic formula as $t\rightarrow +\infty$ for the number of common perpendiculars of length at most $t$ from $D^{-}$ to $D^{+}$ , counted with multiplicities, and we prove the equidistribution in the outer and inner unit normal bundles of $D^{-}$ and $D^{+}$ of the tangent vectors at the endpoints of the common perpendiculars. When the manifold is compact with exponential decay of correlations or arithmetic with finite volume, we give an error term for the asymptotic. As an application, we give an asymptotic formula for the number of connected components of the domain of discontinuity of Kleinian groups as their diameter goes to $0$ .

Information

Type
Research Article
Copyright
© Cambridge University Press, 2016