Ricci Collineations of the Bianchi Type II, VIII, and IX Space-times

Details Ricci Collineations of the Bianchi Type II, VIII, and IX Space-times Ricci Collineations of the Bianchi Type II, VIII, and IX Space-times

2000-01-03

arxiv.org/abs/gr-qc/0001004v1

Gen.Rel.Grav. 28 (1996) 691-700

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 Pages, LaTeX, 1 Table, no figures

Scientific paper

Ricci and contracted Ricci collineations of the Bianchi type II, VIII, and IX space-times, associated with the vector fields of the form (i) one component of $\xi^a(x^b)$ is different from zero and (ii) two components of $\xi^a(x^b)$ are different from zero, for $a,b=1,2,3,4$, are presented. In subcase (i.b), which is $\xi^a= (0,\xi^2(x^a),0,0)$, some known solutions are found, and in subcase (i.d), which is $\xi^a =(0,0,0,\xi^4(x^a))$, choosing $S(t)=const.\times R(t)$, the Bianchi type II, VIII, and IX space-times is reduced to the Robertson-Walker metric.

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