Abstract
We give a complete classification of irreducible symmetric spaces for which there exist proper $SL(2,\mathbb{R})$-actions as isometries, using the criterion for proper actions by T. Kobayashi and combinatorial techniques of nilpotent orbits. In particular, we classify irreducible symmetric spaces that admit surface groups as discontinuous groups, combining this with Benoist’s theorem.
Citation
Takayuki Okuda. "Classification of Semisimple Symmetric Spaces with Proper-Actions." J. Differential Geom. 94 (2) 301 - 342, June 2013. https://doi.org/10.4310/jdg/1367438651
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