Abstract
Homgeneous manifolds of nonpositive sectional curvature can be identified with a certain class of solvable Lie groups. We determine, which of these groups also admit metrics with nonpositive curvature operator; this class is smaller, but still contains many examples.
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Wolter, T.H. Homogeneous manifolds with nonpositive curvature operator. Geom Dedicata 37, 361–370 (1991). https://doi.org/10.1007/BF00181413
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DOI: https://doi.org/10.1007/BF00181413