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- W1646708249 abstract "A Riemannian manifold is called harmonic if its volume density function expressed in polar coordinates centered at any point of the manifold is radial. Flat and rank-one symmetric spaces are harmonic. The converse (the Lichnerowicz Conjecture) is true for manifolds of nonnegative scalar curvature and for some other classes of manifolds, but is not true in general: there exists a family of homogeneous harmonic spaces, the Damek-Ricci spaces, containing noncompact rank-one symmetric spaces, as well as infinitely many nonsymmetric examples. We prove that a harmonic homogeneous manifold of nonpositive curvature is either flat, or is isometric to a Damek-Ricci space." @default.
- W1646708249 created "2016-06-24" @default.
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- W1646708249 date "2004-07-02" @default.
- W1646708249 modified "2023-09-27" @default.
- W1646708249 title "Harmonic homogeneous manifolds of nonpositive curvature" @default.
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