Dual interacting cosmologies and late accelerated expansion

Chimento, Luis P.; Pavón, Diego

doi:10.1103/physrevd.73.063511

Cited by 74 publications

(56 citation statements)

References 53 publications

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“…Specifically, in [165] a link between standard cosmology with quintessence matter and contracting cosmology with phantom, has been shown. Later on this duality was generalized into more complicated DE models, where it has been shown to exist too [166,167,168,169,170,171]. In [172,173] the authors have studied this cosmic duality and its connection to the fates of the universe, while in [174] the author has also discussed the possibility of realizing the aforementioned duality in braneworld cosmological paradigm.…”

Section: Cosmic Dualitymentioning

confidence: 99%

Quintom cosmology: Theoretical implications and observations

et al. 2010

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We review the paradigm of quintom cosmology. This scenario is motivated by the observational indications that the equation of state of dark energy across the cosmological constant boundary is mildly favored, although the data are still far from being conclusive. As a theoretical setup we introduce a no-go theorem existing in quintom cosmology, and based on it we discuss the conditions for the equation of state of dark energy realizing the quintom scenario. The simplest quintom model can be achieved by introducing two scalar fields with one being quintessence and the other phantom. Based on the double-field quintom model we perform a detailed analysis of dark energy perturbations and we discuss their effects on current observations. This type of scenarios usually suffer from a manifest problem due to the existence of a ghost degree of freedom, and thus we review various alternative realizations of the quintom paradigm. The developments in particle physics and string theory provide potential clues indicating that a quintom scenario may be obtained from scalar systems with higher derivative terms, as well as from nonscalar systems. Additionally, we construct a quintom realization in the framework of braneworld cosmology, where the cosmic acceleration and the phantom divide crossing result from the combined effects of the field evolution on the brane and the competition between four and five dimensional gravity. Finally, we study the outsets and fates of a universe in quintom cosmology. In a scenario with null energy condition violation one may obtain a bouncing solution at early times and therefore avoid the Big Bang singularity. Furthermore, if this occurs periodically, we obtain a realization of an oscillating universe. Lastly, we comment on several open issues in quintom cosmology and their connection to future investigations.

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Section: Cosmic Dualitymentioning

confidence: 99%

Quintom cosmology: Theoretical implications and observations

et al. 2010

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“…Interestingly enough, the result Q > 0 guarantees that the ratio ρ m /ρ x asymptotically tends to a constant [2], [13], thus greatly alleviating the coincidence problem.…”

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confidence: 99%

Le Châtelier–Braun principle in cosmological physics

2008

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“…We would like to remark that the above ansatz for Q is not arbitrary. It was chosen so that the ratio between dark matter and dark energy densities tends to a fixed value at late times, thereby alleviating the coincidence problem [11,15,26]. It also yields a constant but unstable ratio at early times.…”

Section: The Interacting Quintessence Modelmentioning

confidence: 99%

“…Models based on at least two matter components (baryonic and dark) and one dark energy component (with a high negative pressure) have been suggested to explain the accelerated rate of expansion and simultaneously alleviate the coincidence problem [10,11]. Further, coupling between dark matter (DM) and dark energy (DE) has been suggested as a possible explanation for the coincidence problem [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the interacting quintessence models of Refs. [11,12] require the ratio of matter and dark energy densities to be constant at late times. The coupling between matter and quintessence is either motivated by high energy particle physics considerations [12] or is constructed by requiring the final matter to dark energy ratio to be stable against perturbations [14 -16].…”

Section: Introductionmentioning

confidence: 99%

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Matter density perturbations in interacting quintessence models

2006

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Models with dark energy decaying into dark matter have been proposed to solve the coincidence problem in cosmology.We study the effect of such coupling in the matter power spectrum. Because of the interaction, the growth of matter density perturbations during the radiation dominated regime is slower compared to noninteracting models with the same ratio of dark matter to dark energy today. This effect introduces a damping on the power spectrum at small scales proportional to the strength of the interaction, c 2 , and similar to the effect generated by ultrarelativistic neutrinos. The interaction also shifts matterradiation equality to larger scales. We compare the matter power spectrum of interacting quintessence models with the measurments of the 2-degree field galaxy redshift survey (2dFGRS). The data are insensitive to values of c 2 ≤ 10 -3 but strongly constrain larger values. We particularize our study to models that during radiation domination have a constant dark matter to dark energy ratio. Models with dark energy decaying into dark matter have been proposed to solve the coincidence problem in cosmology. We study the effect of such coupling in the matter power spectrum. Because of the interaction, the growth of matter density perturbations during the radiation dominated regime is slower compared to noninteracting models with the same ratio of dark matter to dark energy today. This effect introduces a damping on the power spectrum at small scales proportional to the strength of the interaction, c 2 , and similar to the effect generated by ultrarelativistic neutrinos. The interaction also shifts matterradiation equality to larger scales. We compare the matter power spectrum of interacting quintessence models with the measurments of the 2-degree field galaxy redshift survey (2dFGRS). The data are insensitive to values of c 2 10 ÿ3 but strongly constrain larger values. We particularize our study to models that during radiation domination have a constant dark matter to dark energy ratio.

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Dual interacting cosmologies and late accelerated expansion

Abstract: In this paper we show that by considering a universe dominated by two interacting compo-

Cited by 74 publications

References 53 publications

Quintom cosmology: Theoretical implications and observations

Quintom cosmology: Theoretical implications and observations

Le Châtelier–Braun principle in cosmological physics

Matter density perturbations in interacting quintessence models

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