Results 171 to 180 of about 11,605 (193)
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The European Physical Journal Plus, 2020
In this paper, we investigate the quantum Brownian motion of a massive scalar point particle induced by the FRW spacetime in the presence of a linear topological defect named cosmic string. In addition, we also consider a flat boundary orthogonal to the defect to analyze its effect on the particle’s motion.
Herondy Francisco Santana Mota +1 more
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In this paper, we investigate the quantum Brownian motion of a massive scalar point particle induced by the FRW spacetime in the presence of a linear topological defect named cosmic string. In addition, we also consider a flat boundary orthogonal to the defect to analyze its effect on the particle’s motion.
Herondy Francisco Santana Mota +1 more
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International Journal of Theoretical Physics, 2013
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Oliveira-Neto, G. +4 more
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Oliveira-Neto, G. +4 more
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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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From a Five Dimensional Warped Friedmann–Robertson–Walker Universe to the Weyl Integrable Spacetime
International Journal of Theoretical Physics, 2014zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dariescu, Marina-Aura, Dariescu, Ciprian
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Astrophysics and Space Science, 1991
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Coley, A., O'Neill, E.
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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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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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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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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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