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Collineations of (2+1)-Dimensional Friedmann-Robertson-Walker Spacetimes
AIP Conference Proceedings, 2004Conformal Killing and Ricci collineation equations for (2+1)‐dimensional Friedmann‐Robertson‐Walker (FRW) spacetimes are solved. These spacetimes are classified according to their Ricci conformal collineations (RCCs) and Ricci collineations (RCs). In the non‐degenerate and degenerate cases of the Ricci tensor (the cases det(Rab) ≠ 0 and det(Rab) = 0 ...
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Astrophysics and Space Science, 1991
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Coley, A., O'Neill, E.
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zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Coley, A., O'Neill, E.
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Journal of Cosmology and Astroparticle Physics, 2004
Multidimensional cosmological solutions which are locally conformally flat are described, thus leading to generalizations of the Friedmann–Robertson–Walker cosmology.
Miguel Brozos-Vázquez +2 more
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Multidimensional cosmological solutions which are locally conformally flat are described, thus leading to generalizations of the Friedmann–Robertson–Walker cosmology.
Miguel Brozos-Vázquez +2 more
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Physical significance of different classes of Friedmann–Robertson–Walker spacetime
International Journal of Geometric Methods in Modern PhysicsIn this research, Friedmann–Robertson–Walker (FRW) spacetime is classified completely according to Noether symmetries. Different classes are discussed for flat, open and closed universes. According to this classification, we have various forms of cosmic scale factor [Formula: see text].
Farhad Ali, Muhammad Furqan
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Communications in Theoretical Physics, 2000
On the basis of the generalized invariant formulation, the invariant-related unitary transformation method is used to study the evolution of a quantum Dirac field in Friedmann–Robertson–Walker spatially flat spacetime. We first solve the functional Schrodinger equation for a free Dirac field and obtain the exact solutions.
Fu Jian +3 more
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On the basis of the generalized invariant formulation, the invariant-related unitary transformation method is used to study the evolution of a quantum Dirac field in Friedmann–Robertson–Walker spatially flat spacetime. We first solve the functional Schrodinger equation for a free Dirac field and obtain the exact solutions.
Fu Jian +3 more
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Annals of Physics, 2016
Abstract This article has been withdrawn at the request of the Editors. Soon after the publication of this paper was announced, several experts in the field contacted the Editors to report errors. After extensive review, the Editors unanimously concluded that the results are in obvious conflict with a proven scientific fact, i.e., violation of ...
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Abstract This article has been withdrawn at the request of the Editors. Soon after the publication of this paper was announced, several experts in the field contacted the Editors to report errors. After extensive review, the Editors unanimously concluded that the results are in obvious conflict with a proven scientific fact, i.e., violation of ...
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Periodic solutions with equal period for the Friedmann–Robertson–Walker model
Applied Mathematics Letters, 2018Aiyong Chen, Wentao Huang
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STABILITY OF FRIEDMANN-ROBERTSON-WALKER UNIVERSE FILLED WITH MATTER
Wuli Xuebao/Acta Physica Sinica, 2000Zhang Li-Chun
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The recollapse problem of closed Friedmann–Robertson–Walker models in higher-order gravity theories
Journal of Mathematical Physics, 2005John Miritzis, Miritzis John
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