Cosmology of general relativity without energy-momentum conservation

Al-Rawaf, A. S.; Taha, M. O.

doi:10.1007/bf02113090

Cited by 154 publications

(125 citation statements)

References 10 publications

Supporting

Mentioning

113

Contrasting

Order By: Relevance

“…In fact, this theory seems to be in agreement with observational data on the Universe age and also on the Hubble parameter [26]. In addition, Rastall theory can provide an alternative description for the matter dominated era with respect to the GTR [27]. It is also supported by observational data from the helium nucleosynthesis [28].…”

Section: The Rastall Theory From Commutator Algebrasupporting

confidence: 80%

The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion

Licata¹,

Moradpour

Corda

2017

Int. J. Geom. Methods Mod. Phys.

View full text Add to dashboard Cite

In this short review, we discuss the approach of the commutator algebra of covariant derivative to analyse the gravitational theories, starting from the standard Einstein's general theory of relativity and focusing on the Rastall theory. After that, we discuss the important role of the torsion in this mathematical framework.In the Appendix of the paper we analyse the importance of the nascent gravitational wave astronomy as a tool to discriminate among the general theory of relativity and alternative theories of gravity.

show abstract

Section: The Rastall Theory From Commutator Algebrasupporting

confidence: 80%

The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion

Licata¹,

Moradpour

Corda

2017

Int. J. Geom. Methods Mod. Phys.

View full text Add to dashboard Cite

show abstract

“…Moreover, the Universe exhibits an inflationary regime in the matter dominated era if γ < 0. We can also note that due to the particular coupling between matter and gravity, it is possible to get negative values of the critical mass density parameter Ω and at same time a closed or spatially flat Universe [7]. This feature is quite similar to the one displayed by a model which couples ordinary matter with a string induced fluid, when closed Universe can evolve dynamically as an open one [4].…”

Section: Theory IImentioning

confidence: 69%

Perturbative Analysis of Generalized Einstein Theories

Fabris

Kerner

Tossa

2000

Int. J. Mod. Phys. D

View full text Add to dashboard Cite

The hypothesis that the energy-momentum tensor of ordinary matter is not conserved separately, leads to a non-adiabatic expansion and, in many cases, to an Universe older than usual. This may provide a solution for the entropy and age problems of the Standard Cosmological Model. We consider two different theories of this type, and we perform a perturbative analysis, leading to analytical expressions for the evolution of gravitational waves, rotational modes and density perturbations. One of these theories exhibits satisfactory properties at this level, while the other one should be discarded.

show abstract

“…In addition, the Rastall theory leads to better consistency with the observational data of the matter dominated era against the Einstein field equations [53]. Observational data on the helium nucleosynthesis also supports this theory [54].…”

Section: Introductionmentioning

confidence: 66%

Traversable asymptotically flat wormholes in Rastall gravity

2017

View full text Add to dashboard Cite

There are some gravitational theories in which the ordinary energy-momentum conservation law is not valid in the curved spacetime. Rastall gravity is one of the known theories in this regard which includes a non-minimal coupling between geometry and matter fields. Equipped with the basis of such theory, we study the properties of traversable wormholes with flat asymptotes. We investigate the possibility of exact solutions by a source with the baryonic matter state parameter. Our survey indicates that Rastall theory has considerable effects on the wormhole characteristics. In addition, we study various case studies and show that the weak energy condition may be met for some solutions. We also give a discussion regarding to traversability of such wormhole geometry with phantom sources.

show abstract

Cosmology of general relativity without energy-momentum conservation

Cited by 154 publications

References 10 publications

The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion

The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion

Perturbative Analysis of Generalized Einstein Theories

Traversable asymptotically flat wormholes in Rastall gravity

Contact Info

Product

Resources

About