Cosmological model with interactions in the dark sector

Chimento, Luis P.; Forte, Mónica; Kremer, Gilberto M.

doi:10.1007/s10714-008-0694-5

Cited by 53 publications

(63 citation statements)

References 43 publications

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“…This important result can be clarified in the following way. The system (52), in the absence of interaction, is equivalent to the following system for the relative densities Ω dm and Ω de…”

Section: Phenomenology Of Interacting Modelsmentioning

confidence: 99%

Cosmological evolution with interaction between dark energy and dark matter

Bolotin

Kostenko

Lemets

et al. 2015

Int. J. Mod. Phys. D

232

225

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In this review we consider in detail different theoretical topics associated with interaction in the dark sector. We study linear and non-linear interactions which depend on the dark matter and dark energy densities. We consider a number of different models (including the holographic dark energy and dark energy in a fractal universe) with interacting dark energy (DE) and dark matter (DM), have done a thorough analysis of these models. The main task of this review was not only to give an idea about the modern set of different models of dark energy, but to show how much can be diverse dynamics of the universe in these models. We find that the dynamics of a Universe that contains interaction in the dark sector can differ significantly from the Standard Cosmological Model (SCM).

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Section: Phenomenology Of Interacting Modelsmentioning

confidence: 99%

Cosmological evolution with interaction between dark energy and dark matter

Bolotin

Kostenko

Lemets

et al. 2015

Int. J. Mod. Phys. D

232

225

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“…This best fit value for the transition redshift z acc = 0.805 is significantly higher than that obtained in [73] at 1σ CL analyzing distinct databases and in a model-independent way. However, it is typical for models with interactions in the dark sector [57,[74][75][76][77][78].…”

Section: And Inmentioning

confidence: 99%

“…Only hypotheses on their nature exist, most of them assuming that DM and DE are physically unrelated and the similarity in their energy densities (the so called problem of Cosmological Coincidence) is a purely accidental fact [14][15][16][17]. But interactions between DM and DE might alleviate the problem, keeping close values for their densities up to large redshifts as has been shown in a lot of work [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. The interactions between DE and DM appear to be favored in several works, for instance, by Bertolami et al [34][35][36][37] through studies on the Abell Cluster A586, and Abdalla et al [38] where they found the signature of interaction between DE and DM by using optical, X-ray and weak lensing data from 33 relaxed galaxy clusters.…”

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confidence: 99%

On extended sign-changeable interactions in the dark sector

Forte

2014

Gen Relativ Gravit

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We extend the cosmological couplings proposed in Sun et al. and Wei, where they suggested interactions with change of signs along the cosmological evolution. Our extension liberates the changes of sign of the interaction from the deceleration parameter and from the relation of energy densities of the dark sector and considers the presence of non interactive matter. In three cases we obtain the general solutions and the results obtained in models fitted with Hubble's function and SNe Ia data, are analyzed regarding the problem of the cosmological coincidence, the problem of the crisis of the cosmological age and the magnitude of the energy density of dark energy at early universe. Also we graphically study the range of variation of, the actual dark matter density parameter, the effective equation of state of the dark energy and the redshift of transition to the accelerated regimen, generated by variations at order $1\sigma$ in the coupling parameters.Comment: 20 pages, 26 figures,title shortened, new references added, to be published in General Relativity and Gravitation journal. The final publication will be available at Springer via link.springer.com/article/10.1007/s10714-014-1811-

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“…Most of the hypotheses assume that DM and DE are physically unrelated and the similarity in their energy densities is purely accidental. But interactions between DM and DE might alleviate the problem, keeping close values for their densities up to large redshifts as has been shown [6][7][8][9][10][11][12][13][14]. Attempts to unify DE and DM is not a stopping process.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological models of Universe with varying G and Λ

Khurshudyan¹

2014

Open Physics

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Abstract:In this article we will consider several phenomenological models for the Universe with varying G and Λ( ), where G is the gravitational "constant" and Λ( ) is a varying cosmological "constant". Two-component fluid model are taken into account. An interaction of the phenomenological form between a barotropic fluid and a quintessence DE is supposed. Three different forms of Λ( ) will be considered. The problem is analysed numerically and behavior of different cosmological parameters investigated graphically. Conclusion and discussions are given at the end of the work. In an Appendix information concerning to the other cosmological parameters is presented. PACS

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Cosmological model with interactions in the dark sector

Cited by 53 publications

References 43 publications

Cosmological evolution with interaction between dark energy and dark matter

Cosmological evolution with interaction between dark energy and dark matter

On extended sign-changeable interactions in the dark sector

Phenomenological models of Universe with varying G and Λ

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