Large-scale stability and astronomical constraints for coupled dark-energy models

Yang, Weiqiang; Pan, Supriya; Barrow, John D.

doi:10.1103/physrevd.97.043529

Cited by 112 publications

(78 citation statements)

References 92 publications

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“…This behavior was exactly observed in a recent work [71]. It is also interesting to remark that the current IDE models can alleviate the tension on H 0 that is observed in its global [1] and local measurements [61].…”

Section: Discussionsupporting

confidence: 86%

“…That means the inclusion of the factor ð1 þ w x Þ in the interaction releases the prior on w x , which is a beautiful result because now the restriction on the parameter w x is withdrawn, and hence one can test the stability of such interaction models for all w x . This observation has been noticed in a recent paper [71]; however, the current work is different. Here, we do not need to include the extra factor ð1 þ w x Þ because the interaction that we propose in this work already contains such a factor and hence the prior on the dark-energy equation of state, w x , automatically released.…”

Section: Interacting Cosmologysupporting

confidence: 65%

“…That means a discontinuity in the parameters space. A very recent study [71] shows that such difficulties concerning the discontinuity in the parameters space can be solved with a new interaction that includes ð1 þ w x Þ in the interaction function Q. Such a construction of the interaction function is motivated from the pressure perturbations for dark energy, which informs that the inclusion of such a factor releases the prior on the darkenergy equation of state.…”

Section: Discussionmentioning

confidence: 99%

“…Clearly, while constraining the above interaction models, we perceive a discontinuity in the parametric space. To remove such a discrepancy in the interaction models, a recent investigation [71] found that the whole parametric space can be tested if a phenomenological factor ð1 þ w x Þ is introduced in the interaction function, Q. Originally, the hints to introduce such a factor ð1 þ w x Þ in the interaction function are motivated from the pressure perturbation of dark energy.…”

Section: Comparisons Between Ide 1 and Ide 2 And With Other Intermentioning

confidence: 99%

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Novel approach toward the large-scale stable interacting dark-energy models and their astronomical bounds

2017

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Stability analysis of interacting dark-energy models generally divides its parameters space into two regions, (i) w x ≥ −1 and ξ ≥ 0 and (ii) w x ≤ −1 and ξ ≤ 0, where w x is the dark-energy equation of state and ξ is the coupling strength of the interaction. Because of this separation, crucial information about the cosmology and phenomenology of these models may be lost. In a recent study, it has been shown that one can unify the two regions with a coupling function that depends on the dark-energy equation of state. In this work, we introduce a new coupling function that also unifies the two regions of the parameter space and generalizes the previous proposal. We analyze this scenario considering the equation of state of dark energy to be either constant or dynamical. We study the cosmology of such models and constrain both scenarios with the use of the latest astronomical data from both the background evolution as well as large-scale structures. Our analysis shows that a nonzero value of the coupling parameter ξ as well as the dark-energy equation of state other than −1 are allowed. However, within 1σ confidence level, ξ ¼ 0 and the darkenergy equation of state equal to −1 are compatible with the current data. In other words, the observational data allow a very small but nonzero deviation from the Λ cosmology; however, within the 1σ confidence region, the interacting models can mimic the Λ cosmology. In fact, we observe that the models both at the background and perturbative levels are very hard to distinguish from each other and from Λ cosmology as well. Finally, we offer a rigorous analysis on the current tension on H 0 , allowing different regions of the dark-energy equation of state, which shows that interacting dark-energy models reasonably solve the current tension on H 0 .

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Section: Discussionsupporting

confidence: 86%

Section: Interacting Cosmologysupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Comparisons Between Ide 1 and Ide 2 And With Other Intermentioning

confidence: 99%

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Novel approach toward the large-scale stable interacting dark-energy models and their astronomical bounds

2017

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“…Refs. [47,48,49,50,51,52]. In this work we consider an interacting scenario in which vacuum interacts with pressure-less dark matter adopting the more general phenomenological viewpoint, i.e.…”

mentioning

confidence: 99%

Dark sectors with dynamical coupling

et al. 2019

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Coupled dark matter-dark energy scenarios are modeled via a dimensionless parameter ξ, which controls the strength of their interaction. While this coupling is commonly assumed to be constant, there is no underlying physical law or symmetry that forbids a time-dependent ξ parameter. The most general and complete interacting scenarios between the two dark sectors should therefore allow for such a possibility, and it is the main purpose of this study to constrain two possible and wellmotivated coupled cosmologies by means of the most recent and accurate early and late-time universe observations. We find that CMB data alone prefers ξ(z) > 0 and therefore a smaller amount of dark matter, alleviating some crucial and well-known cosmological data tensions. An objective assessment of the Bayesian evidence for the coupled models explored here shows no particular preference for the presence of a dynamical dark sector coupling. more recently, an extra encouraging aspect of these theories has improved their role as an alternative to a pure ΛCDM universe. Namely, in dark matter-dark energy coupled cosmologies the tension between local and CMB estimations of the Hubble constant H 0 could be ameliorated [43,44,45,46]. Current cosmological observations still allow for significant interactions among the two dark sectors, i.e. between dark matter and dark energy, see e.g. Refs. [47,48,49,50,51,52]. In this work we consider an interacting scenario in which vacuum interacts with pressure-less dark matter adopting the more general phenomenological viewpoint, i.e. inspecting a time-dependent coupling. Such a consideration also entails the case of a coupling parameter that remains constant in cosmic time. For our analyses we have assumed that our universe is homogeneous and isotropic, that is, its geometry is well described by the Friedmann-Lemaître-Robertson-Walker line element.The work has been organized as follows. Section 2 contains the gravitational equations within an interacting universe. In Sec. 3 we describe the observational data and the methodology used to constrain the interacting dark energy models. Section 4 presents the observational constraints on the models, including also a Bayesian evidence analysis. Finally, we draw our conclusions in Sec. 5. GRAVITATIONAL EQUATIONS OF A UNIVERSE WITH INTERACTING DARK SECTORSA homogeneous and isotropic universe is well described by the Friedmann-Lemaître-Robertson-Walker (FLRW) metric: arXiv:1906.11697v1 [astro-ph.CO]

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Standard Models and What Lies Beyond

Vagnozzi

2020

Springer Theses

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Large-scale stability and astronomical constraints for coupled dark-energy models

Cited by 112 publications

References 92 publications

Novel approach toward the large-scale stable interacting dark-energy models and their astronomical bounds

Novel approach toward the large-scale stable interacting dark-energy models and their astronomical bounds

Dark sectors with dynamical coupling

Standard Models and What Lies Beyond

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