Rastall Cosmology and the ΛCDM Model
Carlos E. M. Batista,Mahamadou H. Daouda,Júlio C. Fabris,Oliver F. Piattella,Davi C. Rodrigues +4 more
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TLDR
In this article, a two-fluid model is introduced, one component representing vacuum energy whereas the other pressureless matter (e.g. baryons plus cold dark matter), and the cosmological scenario is the same as for the Lambda CDM model, both at background and linear perturbative levels.Abstract:
Rastall's theory is based on the non-conservation of the energy-momentum tensor. We show that, in this theory, if we introduce a two-fluid model, one component representing vacuum energy whereas the other pressureless matter (e.g. baryons plus cold dark matter), the cosmological scenario is the same as for the \Lambda CDM model, both at background and linear perturbative levels, except for one aspect: now dark energy may cluster. We speculate that this can lead to a possibility of distinguishing the models at the non-linear perturbative level.read more
Citations
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Neutron Stars in Rastall Gravity
TL;DR: In this paper, a conservative bound on the non-general relativity behavior of the Rastall theory was established, which should be at the level of 1% of the energy-momentum tensor.
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Rastall gravity is equivalent to Einstein gravity
TL;DR: This article showed that Rastall gravity is completely equivalent to the usual general relativity, and that the gravity sector is completely standard, based as usual on the Einstein tensor, while the matter sector corresponds to an artificially isolated part of the physical conserved stress energy.
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Black hole solutions surrounded by perfect fluid in Rastall theory
Yaghoub Heydarzade,Farhad Darabi +1 more
TL;DR: In this paper, the authors obtained uncharged∖charged Kiselev-like black holes as a new class of black hole solutions surrounded by perfect fluid in the context of Rastall theory.
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A generalization to the Rastall theory and cosmic eras
TL;DR: In this paper, a generalized version of the Rastall theory is proposed and a coupling between geometry and the pressureless matter fields is derived which may play the role of dark energy responsible for the current accelerating expansion phase.
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Einstein and Rastall theories of gravitation in comparison
TL;DR: In this paper, the authors argue that Rastall theory of gravity is an open theory when compared to the general theory of relativity, and that it is ready to accept the challenges of observational cosmology and quantum gravity.
References
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Seven-year wilkinson microwave anisotropy probe (wmap *) observations: cosmological interpretation
Eiichiro Komatsu,Kristine M. Smith,Jo Dunkley,Charles L. Bennett,B. Gold,Gary Hinshaw,Norman Jarosik,Davin Larson,M. R. Nolta,Lyman A. Page,David N. Spergel,Mark Halpern,Robert S. Hill,A. Kogut,Michele Limon,S. S. Meyer,N. Odegard,Gregory S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +20 more
TL;DR: In this article, a combination of seven-year data from WMAP and improved astrophysical data rigorously tests the standard cosmological model and places new constraints on its basic parameters and extensions.
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Mach's principle and a relativistic theory of gravitation
Carl H. Brans,R. H. Dicke +1 more
TL;DR: In this paper, the role of Mach's principle in physics is discussed in relation to the equivalence principle and the difficulties encountered in attempting to incorporate Mach's principles into general relativity are discussed.
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Detection of the baryon acoustic peak in the large-scale correlation function of SDSS luminous red galaxies
Daniel J. Eisenstein,Daniel J. Eisenstein,Idit Zehavi,David W. Hogg,Roman Scoccimarro,Michael R. Blanton,Robert C. Nichol,Ryan Scranton,Hee-Jong Seo,Max Tegmark,Max Tegmark,Zheng Zheng,Scott F. Anderson,James Annis,Neta A. Bahcall,Jon Brinkmann,Scott Burles,Francisco J. Castander,Andrew J. Connolly,István Csabai,Mamoru Doi,Masataka Fukugita,Joshua A. Frieman,Joshua A. Frieman,Karl Glazebrook,James E. Gunn,John S. Hendry,Greg Hennessy,Zeljko Ivezic,Stephen M. Kent,Gillian R. Knapp,Huan Lin,Yeong Shang Loh,Robert H. Lupton,Bruce Margon,Timothy A. McKay,Avery Meiksin,Jeffrey A. Munn,Adrian Pope,Michael W. Richmond,David J. Schlegel,Donald P. Schneider,Kazuhiro Shimasaku,Chris Stoughton,Michael A. Strauss,Mark SubbaRao,Mark SubbaRao,Alexander S. Szalay,István Szapudi,Douglas L. Tucker,Brian Yanny,Donald G. York +51 more
TL;DR: In this paper, a large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies from the Sloan Digital Sky Survey is presented, which demonstrates the linear growth of structure by gravitational instability between z ≈ 1000 and the present and confirms a firm prediction of the standard cosmological theory.
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Cosmological Event Horizons, Thermodynamics, and Particle Creation
TL;DR: In this article, it was shown that the relationship between event horizons and thermodynamics can be extended to cosmological models with a repulsive cosmology constant, and that the spacetime metric itself appears to be observer-dependent.