CLASSICAL AND QUANTUM GRAVITY, cilt.19, sa.24, ss.6435-6443, 2002 (SCI-Expanded)
We study the consequences of the existence of spacelike Ricci inheritance vectors (SpRIVs) parallel to x(alpha) for a model of string cloud and string fluid stress tensor in the context of general relativity. Necessary and sufficient conditions are derived for a spacetime with a model of string cloud and string fluid stress tensor to admit a SpRIV, and a SpRIV which is also a spacelike conformal Killing vector. Also, some results are obtained.