2 citations · 3 across the 5 of their papers we have counts for
6 papers
Force Behaviour in Radiation-Dominated Friedmann Universe
M. Sharif
We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dom…
Non-Static Spherically Symmetric Perfect Fluid Solutions
M. Sharif, T. Iqbal
We investigate solutions of Einstein field equations for the non-static spherically symmetric perfect fluid case using different equations of state. The properties of an exact sphe…
Matter Collineations of Some Static Spherically Symmetric Spacetimes
M. Sharif
We derive matter collineations for some static spherically symmetric spacetimes and compare the results with Killing, Ricci and Curvature symmetries. We conclude that matter and Ri…
Effects of Force and Energy in an Evolving Universe with a Gravitational Source
M. Sharif
Two models are given by crossing the Friedmann metrics with Schwarzschild and Kerr metrics. In these evolving universes with a gravitational source, the force four-vector and the c…
Force and Momentum in an Evolving Axisymmetric Universe Model
M. Sharif
We take an axisymmetric rotating universe model by crossing with a time dependent factor and evaluate its force and momentum in this evolving universe. It is concluded that it beha…
Matter Collineations of Some Well Known Spacetimes
M. Sharif
We derive matter collineations of the Bianchi types I, II, III, VIII and IX, and Kantowski-Sachs spacetimes. It is found that matter collineations turn out similar to Ricci colline…