On differentiable compactifications of the hyperbolic plane and algebraic actions of SL(2;R) on surfaces

Details On differentiable compactifications of the hyperbolic plane and algebraic actions of SL(2;R) on surfaces On differentiable compactifications of the hyperbolic plane and algebraic actions of SL(2;R) on surfaces

2005-06-08

arxiv.org/abs/math/0506130v1

Geometriae Dedicata 125 (2007) 253-270

Mathematics

Metric Geometry

18 p

Scientific paper

It is known that the hyperbolic plane admits a countable infinity of compactifications into a closed disk such that the isometric action of SL(2;R) acts analytically on the compactified space. We prove that among those compactifications, only the two most classical ones (namely the closures of Poincar\'e's disk and Klein's disk) are algebraic, that is to say obtained as a union of orbits of a projectivized linear representation of SL(2;R). More generally, we classify all algebraic actions of SL(2;R) on surfaces.

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