Abstract
We give a topological classification of cohomogeneity two Riemannian G-manifolds of nonpositive curvature and their orbits, under the condition that \({M^{G} \neq \emptyset}\) and the universal Riemannian covering of M has a suitable decomposition.
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Mirzaie, R., Sorush, H. Topology of orbits and orbit spaces of some product G-manifolds. manuscripta math. 149, 297–302 (2016). https://doi.org/10.1007/s00229-015-0786-y
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DOI: https://doi.org/10.1007/s00229-015-0786-y