Group actions, geodesic loops, and symmetries of compact hyperbolic 3-manifolds

Details Group actions, geodesic loops, and symmetries of compact hyperbolic 3-manifolds Group actions, geodesic loops, and symmetries of compact hyperbolic 3-manifolds

2004-02-19

arxiv.org/abs/astro-ph/0402455v1

Astronomy and Astrophysics

Astrophysics

23 pages, 2 figures

Scientific paper

Compact hyperbolic 3-manifolds are used in cosmological models. Their topology is characterized by their homotopy group $\pi_1(M)$ whose elements multiply by path concatenation. The universal covering of the compact manifold $M$ is the hyperbolic space $H^3$ or the hyperbolic ball $B^3$. They share with $M$ a Riemannian metric of constant negative curvature and allow for the isometric action of the group $Sl(2,C)$. The homotopy group $\pi_1(M)$ acts as a uniform lattice $\Gamma(M)$ on $B^3$ and tesselates it by copies of $M$. Its elements $g$ produce preimage and image points for geodesic sections on $B^3$ which by self-intersection form geodesic loops on $M$. For any fixed hyperbolic $g \in \Gamma$ we construct a continuous commutative two-parameter normalizer $N_g

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