Algebraic properties of curvature operators in Lorentzian manifolds with large isometry groups.
Calvaruso, Giovanni, García-Río, Eduardo (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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Calvaruso, Giovanni, García-Río, Eduardo (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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Nicolescu, Liviu, Pripoae, Gabriel (1999)
Balkan Journal of Geometry and its Applications (BJGA)
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Jing Mao (2016)
Czechoslovak Mathematical Journal
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In this paper, for complete Riemannian manifolds with radial Ricci or sectional curvature bounded from below or above, respectively, with respect to some point, we prove several volume comparison theorems, which can be seen as extensions of already existing results. In fact, under this radial curvature assumption, the model space is the spherically symmetric manifold, which is also called the generalized space form, determined by the bound of the radial curvature, and moreover, volume...
Barbara Opozda (1983)
Annales Polonici Mathematici
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Eric Boeckx, Lieven Vanhecke (2001)
Czechoslovak Mathematical Journal
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As a first step in the search for curvature homogeneous unit tangent sphere bundles we derive necessary and sufficient conditions for a manifold to have a unit tangent sphere bundle with constant scalar curvature. We give complete classifications for low dimensions and for conformally flat manifolds. Further, we determine when the unit tangent sphere bundle is Einstein or Ricci-parallel.
Paweł Grzegorz Walczak (1984)
Banach Center Publications
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Akito Futaki (1993)
Inventiones mathematicae
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Ryszard Deszcz, Miroslava Petrović-Torgašev, Zerrin Şentürk, Leopold Verstraelen (2010)
Publications de l'Institut Mathématique
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Sarić, Branko (2000)
Lobachevskii Journal of Mathematics
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Bueken, P., Gillard, J., Vanhecke, L. (1997)
General Mathematics
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