JOURNAL OF GEOMETRY AND PHYSICS, vol.13, no.3, pp.207-222, 1994 (SCI-Expanded)
Article / Article
JOURNAL OF GEOMETRY AND PHYSICS
Science Citation Index Expanded (SCI-EXPANDED), Scopus
Middle East Technical University Affiliated:
Null and infinitesimal isotropy are defined for semi-Riemannian manifolds in a more general context. A theorem of Karcher is extended to semi-Riemannian manifolds in a more general setting. Also, by using this theorem, a characterization of static blackhole metrics can be made as well as a characterization of Robertson-Walker metrics as Karcher made.