Dark energy, dissipation, and the coincidence problem

Chimento, Luis P.; Jakubi, Alejandro S.; Pavón, Diego

doi:10.1103/physrevd.67.087302

Cited by 69 publications

(62 citation statements)

References 20 publications

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“…This is reminiscent of the situation in scalar-tensor theories of gravity and also arises in string theory. Non-minimal couplings have also been extensively considered in the literature, namely, between a scalar field and matter, including baryons and dark matter [14,18,19,20,21,22,23]. These couplings imply the violation of the equivalence principle, which is highly constrained by solar system experimental tests [24,25].…”

Section: Introductionmentioning

confidence: 99%

Extra force inf(R)modified theories of gravity

Bertolami¹,

et al. 2007

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The equation of motion for massive particles in f (R) modified theories of gravity is derived. By considering an explicit coupling between an arbitrary function of the scalar curvature, R, and the Lagrangian density of matter, it is shown that an extra force arises. This extra force is orthogonal to the four-velocity and the corresponding acceleration law is obtained in the weak field limit. Connections with MOND and with the Pioneer anomaly are further discussed.

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Section: Introductionmentioning

confidence: 99%

Extra force inf(R)modified theories of gravity

Bertolami¹,

et al. 2007

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“…4 In the case of the SCM, one of the more promising directions of generalization is the replacement of the cosmological constant with a more complicated, dynamic form of dark energy, 3,[5][6][7] as well as the inclusion of interaction between the dark components. [8][9][10][11][12][13][14][15][16][17][18][19][21][22][23][24][25][26][27][28] Typically, DE models are based on scalar fields minimally coupled to gravity, and do not implement the explicit coupling of the field to the background matter. However there is no fundamental reason for this assumption in the absence of an underlying symmetry which would suppress the coupling.…”

Section: Introductionmentioning

confidence: 99%

Cosmological evolution with interaction between dark energy and dark matter

Bolotin

Kostenko

Lemets

et al. 2015

Int. J. Mod. Phys. D

228

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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“…In the context of Einstein's general theory of relativity, this result implies either the existence of some sort of dark energy, constant or that varies slowly with time and space (see [1,2] for recent reviews), or that the matter content of the universe is subject to dissipative processes [3,4]. On the other hand, since SNe Ia observations are affected by at least four different sources of opacity, namely, the Milky Way, the hosting galaxy, intervening galaxies, and the intergalactic medium, alternative mechanisms contributing to the acceleration evidence or even mimicking the dark energy behaviour have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Probing cosmic opacity at high redshifts with gamma-ray bursts

Holanda

Busti

2014

Phys. Rev. D

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Probing the evolution of the universe at high redshifts with standard candles is a powerful way to discriminate dark energy models, where an open question nowadays is whether this component is constant or evolves with time. One possible source of ambiguity in this kind of analyses comes from cosmic opacity, which can mimick a dark enery behaviour. However, most tests of cosmic opacity have been restricted to the redshift range z < 2. In this work, by using luminosity distances of gamma-ray bursts (GRBs), given the validity of the Amati relation, and the latest H(z) data we determine constraints on the cosmic opacity at high redshifts (z > 2) for a flat ΛCDM model. A possible degenerescence of the results with the adopted cosmological model is also investigated by considering a flat XCDM model. The limits on cosmic opacity in the redshift range 0 < z < 2 are updated with type Ia supernovae (SNe Ia) from the Union2.1 sample, where we added the most distant (z = 1.713) spectroscopically confirmed SNe Ia. From the analyses performed, we find that both SNe Ia and GRBs samples are compatible with a transparent universe at 1σ level and the results are independent of the dark energy equation of state parameter w.

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Dark energy, dissipation, and the coincidence problem

Cited by 69 publications

References 20 publications

Extra force inf(R)modified theories of gravity

Extra force inf(R)modified theories of gravity

Cosmological evolution with interaction between dark energy and dark matter

Probing cosmic opacity at high redshifts with gamma-ray bursts

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