Comment on Ricci Collineations for spherically symmetric space-times

Details Comment on Ricci Collineations for spherically symmetric space-times Comment on Ricci Collineations for spherically symmetric space-times

2001-08-25

arxiv.org/abs/gr-qc/0108064v1

Gen.Rel.Grav. 34 (2002) 49-52

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

3 pages. Accepted for publication in General Relativity and Gravitation

Scientific paper

It is shown that the results of the paper by Contreras et al. [Contreras, G., Nunez, L. A., Percoco, U. "Ricci Collineations for Non-degenerate, Diagonal and Spherically Symmetric Ricci Tensors" (2000) Gen. Rel. Grav. 32, 285-294] concerning the Ricci Collineations in spherically symmetric space-times with non-degenerate and diagonal Ricci tensor do not cover all possible cases. Furthermore the complete algebra of Ricci Collineations of certain Robertson-Walker metrics of vanishing spatial curvature are given.

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