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Published online by Cambridge University Press: 09 August 2007
Let H be the n-dimensional hyperbolic space of constant sectional curvature –1 and let G be the identity component of the isometry group of H. We find all the G-invariant pseudo-Riemannian metrics on the space of oriented geodesics of H (modulo orientation preserving reparametrizations). We characterize the null, time- and space-like curves, providing a relationship between the geometries of
and H. Moreover, we show that
is Kähler and find an orthogonal almost complex structure on
.