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  • 11
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    Late time acceleration in model (2012)
    Springer
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    Publication Date: 2012-10-04
    Description:    Late time transition is obtained with a function of Gauss Bonnet curvature f ( G ) in the Einstein Hilbert action with a matter field in a FLRW spacetime assuming an ansatz without a specific f ( G ) . Late time accelerating expansion is either a phantom era without Big Rip singularity or a quintessence era or a de-Sitter era of expansion. The equation of state parameter, jerk and snap parameters support observational data and the function f ( G ) obtained from the solution supports earlier works. Content Type Journal Article Category Research Article Pages 1-12 DOI 10.1007/s10714-012-1461-1 Authors B. Modak, Department of Physics, University of Kalyani, Kalyani, 741235 India Malay Krishna Dutta, Department of Physics, BRSN College, Barrackpore, 740120 India Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
    Print ISSN: 0001-7701
    Electronic ISSN: 1572-9532
    Topics: Physics
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  • 12
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    Dark energy, cosmic coincidence and future singularity of the universe (2012)
    Springer
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    Publication Date: 2012-10-13
    Description:    Dark energy model with the equation of state p DE = - r DE - A r DE a , is characterised by four finite life time future singularity of the universe for different values of the parameter A and a [Nojiri et al. in Phys Rev D 71:063004, 2005]. Since from the matter dominated era to the dark energy dominated era the ratio of the dark energy density to the matter energy density increases as the universe expand for these future singularities, the universe passes through a significant time when the dark energy density and the matter energy density are nearly comparable. Considering \frac1 r 0 〈 r =\frac r DE r M 〈 r 0 , where r 0 is any fixed ratio, we calculate the fraction of total life time of the universe when the universe passes through the coincidental stage for these singularities. It has been found that the fractional time varies as a varies within the range for which these finite life time future singularities occur and the fraction is smaller for smaller values of r 0 . Importance of the fractional time and observational limits onto the values of the parameter A and a has also been discussed. Content Type Journal Article Category Research Article Pages 1-10 DOI 10.1007/s10714-012-1456-y Authors Sanjay Sarkar, Department of Mathematics, Gauhati University, Guwahati, 781014 India Chandra Rekha Mahanta, Department of Mathematics, Cotton College, Guwahati, 781001 India Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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    Topics: Physics
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  • 13
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    Radiating shear-free gravitational collapse with charge (2012)
    Springer
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    Publication Date: 2012-10-13
    Description:    We present here a new shear free model for the gravitational collapse of a spherically symmetric charged body. We propose a dissipative contraction with radiation emitted outwards represented by the Vaidya–Reissner–Nordström metric. The Einstein field equations, using the junction conditions and an ansatz, are integrated numerically. A check of the energy conditions is also performed. We obtain that the charge delays the Reissner–Nordström black hole formation and it can even prevent the collapse. Content Type Journal Article Category Research Article Pages 1-19 DOI 10.1007/s10714-012-1468-7 Authors G. Pinheiro, Divisão de Programas de Pós-Graduação, Observatório Nacional, Rua General José Cristino, 77, São Cristóvão, Rio de Janeiro, RJ 20921-400, Brazil R. Chan, Coordenação de Astronomia e Astrofísica, Observatório Nacional, Rua General José Cristino, 77, São Cristóvão, Rio de Janeiro, RJ 20921-400, Brazil Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 14
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    On the weak field approximation of the de Sitter gauge theory of gravity (2012)
    Springer
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    Publication Date: 2012-10-13
    Description:    The weak field approximation of a model of de Sitter gauge theory of gravity is studied in two cases. Without torsion and spin current, the model cannot give the right non-relativistic approximation unless the density is a constant. With small torsion, a satisfactory Newtonian approximation can be obtained. Content Type Journal Article Category Research Article Pages 1-11 DOI 10.1007/s10714-012-1466-9 Authors Meng-Sen Ma, Department of Physics, Shanxi Datong University, Datong, 037009 China Chao-Guang Huang, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 15
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    Particle capture by radiation drag around a highly luminous compact stars (2012)
    Springer
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    Publication Date: 2012-09-24
    Description:    In the present work, we explored the effect of the radiation on the effective impact parameter for capture in a fully general relativistic manner. To summarize our results, evidently due to the radiation drag (the Poynting–Robertson effect), critical impact parameter of point particle gets larger by the factor of two, thus, the effective cross section of the luminous relativistic star becomes 4 times larger than that of the star without radiation emission. In addition, the finite size effect of the star adds up to this growth of the effective cross section. Content Type Journal Article Category Research Article Pages 1-12 DOI 10.1007/s10714-012-1455-z Authors Jae Sok Oh, Astronomy and Space Technology R&D Division, Korea Astronomy and Space Science Institute, Daejeon, 305-348 Korea Chan Park, Astronomy and Space Technology R&D Division, Korea Astronomy and Space Science Institute, Daejeon, 305-348 Korea Hongsu Kim, Advanced Astronomy and Space Science Division, Korea Astronomy and Space Science Institute, Daejeon, 305-348 Korea Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 16
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    Generalized Painlevé–Gullstrand descriptions of Kerr–Newman black holes (2012)
    Springer
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    Publication Date: 2012-10-04
    Description:    Generalized Painlevé–Gullstrand metrics are explicitly constructed for the Kerr–Newman family of charged rotating black holes. These descriptions are free of all coordinate singularities; moreover, unlike the Doran and other proposed metrics, an extra tunable function is introduced to ensure all variables in the metrics remain real for all values of the mass M , charge Q , angular momentum aM , and cosmological constant $${\Lambda } 〉 -\frac{3}{a^2}$$ . To describe fermions in Kerr–Newman spacetimes, the stronger requirement of non-singular vierbein one-forms at the horizon(s) is imposed and coordinate singularities are eliminated by local Lorentz boosts. Other known vierbein fields of Kerr–Newman black holes are analysed and discussed; and it is revealed that some of these descriptions are actually not related by physical Lorentz transformations to the original Kerr–Newman expression in Boyer–Lindquist coordinates—which is the reason complex components appear (for certain ranges of the radial coordinate) in these metrics. As an application of our constructions the correct effective Hawking temperature for Kerr black holes is derived with the method of Parikh and Wilczek. Content Type Journal Article Category Research Article Pages 1-12 DOI 10.1007/s10714-012-1459-8 Authors Huei-Chen Lin, Department of Physics, National Cheng Kung University, Tainan,  701 Taiwan Chopin Soo, Department of Physics, National Cheng Kung University, Tainan,  701 Taiwan Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 17
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    Steven M. Christensen (ed.): Bryce DeWitt’s Lectures on Gravitation (2012)
    Springer
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    Publication Date: 2012-04-12
    Description: Steven M. Christensen (ed.): Bryce DeWitt’s Lectures on Gravitation Content Type Journal Article Category Book Review Pages 1-3 DOI 10.1007/s10714-012-1343-6 Authors Norbert Dragon, Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 18
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    Hawking radiation of some black holes via the non-equilibrium Landauer transport model (2012)
    Springer
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    Publication Date: 2012-04-14
    Description:    Recently, Nation et al. confirmed that fluxes of Hawking radiation energy and entropy from a black hole can be regarded as a one-dimensional (1D) non-equilibrium Landauer transport process. Their work can be extended to background space-times with gauge potential. The result shows that the energy flux of charged particles, which is shown to be equal to the energy–momentum tensor flux, contains not only the contribution of thermal flux but also that of particle flux. It is found that the charge can also be transported by the 1D quantum channel. Moreover, the entropy production rate is also investigated, which is shown to be larger than the case without chemical potential. Content Type Journal Article Category Research Article Pages 1-16 DOI 10.1007/s10714-012-1359-y Authors Xiao-Xiong Zeng, Department of Physics, Institute of Theoretical Physics, Beijing Normal University, Beijing, 100875 China Wen-Biao Liu, Department of Physics, Institute of Theoretical Physics, Beijing Normal University, Beijing, 100875 China Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 19
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    Republication of: The geometry of free fall and light propagation (2012)
    Springer
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    Publication Date: 2012-04-17
    Description:    This is a reprinting of the paper by Jürgen Ehlers, Felix Pirani and Alfred Schild, first published in 1972 in a separate volume containing articles written in hounour of J. L. Synge. The original book is long out of print and almost forgotten by today. The authors present a method of deriving the Lorentzian geometry from compatible conformal and projective structures on a four dimensional manifold. The paper has been selected by the Editors of General Relativity and Gravitation for re-publication in the Golden Oldies series of the journal. This republication is accompanied by an editorial note written by Andrzej Trautman. Content Type Journal Article Category Golden Oldie Pages 1-23 DOI 10.1007/s10714-012-1353-4 Authors Jürgen Ehlers, Potsdam, Germany Felix A. E. Pirani, 22 Siddons Buildings, 39 Tavistock Street, London, WC2E 7NT UK Alfred Schild, Austin, TX, USA Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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  • 20
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    Coupling shape dynamics to matter gives spacetime (2012)
    Springer
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    Publication Date: 2012-04-09
    Description:    Shape dynamics is a metric theory of pure gravity, equivalent to general relativity, but formulated as a gauge theory of spatial diffeomporphisms and local spatial conformal transformations. In this paper we extend the construction of shape dynamics form pure gravity to gravity-matter systems and find that there is no fundamental obstruction for the coupling of gravity to standard matter. We use the matter gravity system to construct a clock and rod model for shape dynamics which allows us to recover a spacetime interpretation of shape dynamics trajectories. Content Type Journal Article Category Research Article Pages 1-15 DOI 10.1007/s10714-012-1355-2 Authors Henrique Gomes, University of California at Davis, One Shields Avenue, Davis, CA 95616, USA Tim Koslowski, Perimeter Institute for Theoretical Physics, 31 Caroline Street, Waterloo, ON N2L 2Y5, Canada Journal General Relativity and Gravitation Online ISSN 1572-9532 Print ISSN 0001-7701
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