Timelike and spacelike Ricci colloneation vectors in string cosmology

Yilmaz I.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D, vol.10, no.5, pp.681-690, 2001 (SCI-Expanded) identifier identifier


In this paper, we study the consequences of the existence of timelike and spacelike Ricci collineation vectors (RCVs) for string cloud in the context of general relativity. Necessary and sufficient conditions are derived for a space-time with string cloud to admit a timelike RCV parallel to u(a) and a spacelike RCV parallel to x(a). Also, some results are obtained.