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The momentum 4-vector in bulk viscous Bianchi type-V space-time

“…Virbhadra [14], Xulu [22], and Radinschi [23] show that the energy momentum definitions of Einstein, Landau-Lifshitz, Papapetrou, Weinberg, Penrose, and…”

“…Virbhadra [17], using the energy and momentum complexes of Einstein, Landau-Lifshitz, Papapetrou, and Weinberg for a general non-static spherically symmetric metric of the Kerr-Schild class, showed that all of these energy-momentum formulations give the same energy distribution as in the Penrose energy-momentum formulation. Later, Xulu [22], Radinschi [23], and Saltı-Havare [24] considered the Bergmann-Thomson energy and/or momentum formulation for different space-time model and showed that the definition of Bergmann-Thomson agree with the other energy-momentum complexes. Xulu made the calculations using the Kerr-Schild cartesian coordinates and the Bergmann-Thomson definition provides for the given metric the same energy expression for the energy-momentum distributions as the Einstein, LandauLisfhitz, Papapetrou, and Weinberg energy-momentum definitions.…”

Energy–momentum in Viscous Kasner-Type Universe in Bergmann–thomson Formulations

“…The energymomentum complexes give meaningful results when we transform the line element in quasi-Cartesian coordinates. The energy and momentum complex of Møller gives the possibility to make the calculations in any coordinate system [9]. To this end Virbhadra and his collaborators have considered many space-time models and have shown that several energy-momentum complexes give the same and acceptable results for a given space-time [10,11,12,13,14,15,16,17,18].…”

Energy Distribution in a Schwarzschild-like Spacetime

“…The large number of interesting results recently obtained by many researchers point out that the energy-momentum complexes are powerful tools for evaluating the energy and momentum in a given space-time Virbhadra, 1995, 1997;Xulu, 1998a,b;Vagenas, 2003b;Radinschi, 1999Radinschi, , 2000bYang and Radinschi, 2003a;Bringley, 2002;Súkeník and Sima, 2001;Sharif and Fatima, 2005a;Sharif, 2004b,a;Gad, 2004cGad, , 2005aGad, , 2004aPatashnick, 2005;Salti, 2005d,b;Halpern, 2006). Important works are done with the energy-momentum complexes in 2-and 3-dimensional space-times (Vagenas, 2003c(Vagenas, ,d, 2005Grammenos, 2005).…”