Cohomogeneity one actions on anti de Sitter spacetimes
Abstract
In this paper we classify, up to orbit equivalence, cohomogeneity one actions of connected closed Lie subgroups of U(1,n) on the (2n+1)-dimensional anti de Sitter spacetime AdS2n+1. We also give some new examples of nonproper cohomogeneity one actions on AdSn+1 and determine parabolic Lie subgroups of SO(2,n) and their orbits in AdSn+1
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