Cosmological evolution with interaction between dark energy and dark matter

Bolotin, Yu. L.; Kostenko, A.; Lemets, O. A.; Yerokhin, D. A.

doi:10.1142/s0218271815300074

Cited by 232 publications

(233 citation statements)

References 236 publications

(261 reference statements)

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“…(7)- (12). To prove this one can follow the calculations outlined in Appendix A assuming no interaction with the scalar field; see also [28].…”

Section: Lagrangian Formulation Of Relativistic Fluidsmentioning

confidence: 95%

“…Note however that if both dark matter and dark energy can be measured solely by their gravitational influence, then the physical consequences of their interaction might be observationally indistinguishable from similar effects arising in other cosmological models without interaction, as for example in modified gravity and warm dark matter models [9][10][11]. Nevertheless it is important to study different interacting dark energy models not only to search for new interesting phenomenological features, but also to support the observational efforts to focus on possible distinctive signatures of such models; a tentative review on these models has recently been proposed in [12] (see also [19]). …”

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confidence: 99%

“…Throughout the last fifteen years an impressive amount of possible choices has been studied, the most common being Q ∝ ρφ, which can easily be motivated in the Einstein frame formulation of scalar-tensor theories [15][16][17][18]. We cannot discuss in detail this vast amount of literature and the interested reader is referred to [12,19] and in the references therein which provides a general overview of this subject (see also [20][21][22][23] for some recent works).…”

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confidence: 99%

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Interacting quintessence from a variational approach. I. Algebraic couplings

2015

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We present a new approach to build models of quintessence interacting with dark or baryonic matter. We use a variational approach for relativistic fluids to realize an effective description of matter fields at the Lagrangian level. The coupling is introduced directly in the action by considering a single function mixing the dynamical degrees of freedom of the theory. The resulting gravitational field equations are derived by variations with respect to the independent variables. New interesting phenomenology can be obtained at both small scales, where new screening mechanisms for scalar fields can be realized, and large scales, where one finds an original and rich class of interacting quintessence models. The background cosmology of two of these models is studied in detail using dynamical system techniques. We find a variety of interesting results: for instance, these models contain dark energy dominated late time attractors and scaling solutions, both with early time matter dominated epochs and a possible inflationary origin. In general this new approach provides the starting point for future in depth studies on new interacting quintessence models. CONTENTS

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“…(7)- (12). To prove this one can follow the calculations outlined in Appendix A assuming no interaction with the scalar field; see also [28].…”

Section: Lagrangian Formulation Of Relativistic Fluidsmentioning

confidence: 95%

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confidence: 99%

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confidence: 99%

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Interacting quintessence from a variational approach. I. Algebraic couplings

2015

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“…Moreover, discussed models of holographic dark energy models belongs to generalization considered in Reference [24] which allows us to unify symmetry in early universe and LSU in sense of accelerated expansion. In recent scientific literature there is an active interest towards in interacting DE models, which is a non-gravitational coupling between DE and DM revealing interesting symmetry [49] (and references therein). There are various forms of linear and non linear forms of interactions considered in modern cosmology.…”

Section: Eos Parameter Mattermentioning

confidence: 99%

On the Phenomenology of an Accelerated Large-Scale Universe

Khurshudyan

2016

Symmetry

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Abstract:In this review paper, several new results towards the explanation of the accelerated expansion of the large-scale universe is discussed. On the other hand, inflation is the early-time accelerated era and the universe is symmetric in the sense of accelerated expansion. The accelerated expansion of is one of the long standing problems in modern cosmology, and physics in general. There are several well defined approaches to solve this problem. One of them is an assumption concerning the existence of dark energy in recent universe. It is believed that dark energy is responsible for antigravity, while dark matter has gravitational nature and is responsible, in general, for structure formation. A different approach is an appropriate modification of general relativity including, for instance, f (R) and f (T) theories of gravity. On the other hand, attempts to build theories of quantum gravity and assumptions about existence of extra dimensions, possible variability of the gravitational constant and the speed of the light (among others), provide interesting modifications of general relativity applicable to problems of modern cosmology, too. In particular, here two groups of cosmological models are discussed. In the first group the problem of the accelerated expansion of large-scale universe is discussed involving a new idea, named the varying ghost dark energy. On the other hand, the second group contains cosmological models addressed to the same problem involving either new parameterizations of the equation of state parameter of dark energy (like varying polytropic gas), or nonlinear interactions between dark energy and dark matter. Moreover, for cosmological models involving varying ghost dark energy, massless particle creation in appropriate radiation dominated universe (when the background dynamics is due to general relativity) is demonstrated as well. Exploring the nature of the accelerated expansion of the large-scale universe involving generalized holographic dark energy model with a specific Nojiri-Odintsov cut-off is presented to finalize the paper.

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“…[25] offers a recent review of this topic). Recently, the authors of [26] showed that this kind of interaction is favored by current cosmological observations in an extended ΛCDM model.…”

Section: Introductionmentioning

confidence: 99%

Ghost Dark Energy Model with Non-linear Interaction

Revistas¹,

García²

2018

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In this paper we study a dark energy model taking into account a non-linear interaction between the dark energy and dark matter components. The non-linear interaction term, used in this work, is proportional to the square of dark energy density. Considering a FRW type flat universe, we obtain an analytical expression for the Hubble parameter H and from this quantity, the deceleration parameter q and the equation of state parameter w Λ are analyzed. We found that, in this scenario, the accelerated expansion regime of the universe in late times is possible. However, using suitable values for the coupling constant, the square of the speed of sound remains negative, therefore, the model is unstable under small perturbations.Keywords: Dark Energy; Cosmology. IntroductionThe accelerated expansion of the universe was discovered in 1998 from the analysis of astrophysical information obtained from the supernovae type Ia (SNIa) (basically, from measurement of luminosity distances) [1], as well as from the anisotropies observed in the cosmic microwave background (CMB) radiation [2], and the study of the large scale structure (LSS) of the universe [3]. This accelerated expansion is consistent with the idea that the universe has an unknown form of energy density with negative pressure, so called dark energy (DE). The amount of DE in the universe is about 70% and the remaining 30% correspond to matter and radiation densities. A huge amount of DE models have been proposed in the literature [4,5,6], but until now, there is not a satisfactory explanation of this phenomenon. In the ΛCDM model, the role of DE is played by the cosmological constant Λ (vacuum energy), but this model has two main problems: the fine tuning problem and the coincidence problem [7].Recently, a different proposal has attracted considerable attention, a model which has its roots on the Veneziano ghost of QCD [8,9,10,11] and is known as QCD ghost dark energy [12]. The key ingredient of this new model is that

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Cosmological evolution with interaction between dark energy and dark matter

Cited by 232 publications

References 236 publications

Interacting quintessence from a variational approach. I. Algebraic couplings

Interacting quintessence from a variational approach. I. Algebraic couplings

On the Phenomenology of an Accelerated Large-Scale Universe

Ghost Dark Energy Model with Non-linear Interaction

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