Abstract
Four-dimensional locally homogeneous Riemannian manifolds are either locally symmetric or locally isometric to Riemannian Lie groups. We determine how and to what extent this result holds in the Lorentzian case.
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Communicated by A. Cap.
G. Calvaruso was partially supported by funds of the University of Salento and GNSAGA (Italy)
This work was prepared during the stay of the second author at the University of Salento. A. Zaeim wishes to thank the Department of Mathematics of the University of Salento for the hospitality.
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Calvaruso, G., Zaeim, A. Four-dimensional homogeneous Lorentzian manifolds. Monatsh Math 174, 377–402 (2014). https://doi.org/10.1007/s00605-013-0588-9
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DOI: https://doi.org/10.1007/s00605-013-0588-9
Keywords
- Homogeneous Lorentzian manifolds
- Ricci operator
- Pseudo-Riemannian homogeneous structures
- Curvature homogeneity