23 citations · 34 across the 2 of their papers we have counts for
4 papers
Geometric symmetries on Lorentzian manifolds
K. Saifullah
Lie derivatives of various geometrical and physical quantities define symmetries and conformal symmetries in general relativity. Thus we obtain motions, collineations, conformal mo…
Conformal motions in plane symmetric static spacetimes
K. Saifullah, Shair-e-Yazdan
In this paper, conformal motions are studied in plane symmetric static spacetimes. The general solution of conformal Killing equations and the general form of the conformal Killing…
Weyl collineations that are not curvature collineations
Ibrar Hussain, Asghar Qadir, K. Saifullah
Though the Weyl tensor is a linear combination of the curvature tensor, Ricci tensor and Ricci scalar, it does not have all and only the Lie symmetries of these tensors since it is…
Lie symmetries of the energy-momentum tensor for plane symmetric static spacetimes
K. Saifullah
Matter collineations (MCs) are the vector fields along which the energy-momentum tensor remains invariant under the Lie transport. Invariance of the metric, the Ricci and the Riema…