Testing coupled dark energy with next-generation large-scale observations

Amendola, Luca; Pettorino, V.; Quercellini, Claudia; Vollmer, Adrian

doi:10.1103/physrevd.85.103008

Cited by 70 publications

(91 citation statements)

References 87 publications

(114 reference statements)

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“…In any case, the goodness of fit does not point towards a preference for non-zero coupling. Degeneracy between the coupling and other cosmological parameters is shown in the other panels of the same figure, with results compatible with those discussed in Amendola et al (2012) and Pettorino (2013). Looking at the conservation equations (i.e., Eqs.…”

Section: Non-universal Couplings: Coupled Dark Energysupporting

confidence: 83%

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Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

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We study the implications of Planck data for models of dark energy (DE) and modified gravity (MG) beyond the standard cosmological constant scenario. We start with cases where the DE only directly affects the background evolution, considering Taylor expansions of the equation of state w(a), as well as principal component analysis and parameterizations related to the potential of a minimally coupled DE scalar field. When estimating the density of DE at early times, we significantly improve present constraints and find that it has to be below ∼2% (at 95% confidence) of the critical density, even when forced to play a role for z < 50 only. We then move to general parameterizations of the DE or MG perturbations that encompass both effective field theories and the phenomenology of gravitational potentials in MG models. Lastly, we test a range of specific models, such as k-essence, f (R) theories, and coupled DE. In addition to the latest Planck data, for our main analyses, we use background constraints from baryonic acoustic oscillations, type-Ia supernovae, and local measurements of the Hubble constant. We further show the impact of measurements of the cosmological perturbations, such as redshift-space distortions and weak gravitational lensing. These additional probes are important tools for testing MG models and for breaking degeneracies that are still present in the combination of Planck and background data sets. All results that include only background parameterizations (expansion of the equation of state, early DE, general potentials in minimally-coupled scalar fields or principal component analysis) are in agreement with ΛCDM. When testing models that also change perturbations (even when the background is fixed to ΛCDM), some tensions appear in a few scenarios: the maximum one found is ∼2σ for Planck TT+lowP when parameterizing observables related to the gravitational potentials with a chosen time dependence; the tension increases to, at most, 3σ when external data sets are included. It however disappears when including CMB lensing.

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Section: Non-universal Couplings: Coupled Dark Energysupporting

confidence: 83%

“…The amplitude V 0 is fixed thanks to an iterative routine, as implemented by Amendola et al (2012), Pettorino et al (2012). To a first approximation α only affects late-time cosmology.…”

Section: Non-universal Couplings: Coupled Dark Energymentioning

confidence: 99%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

589

266

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“…The different time evolution of the gravitational potentials in interacting models induces several effects that change the radiation power spectrum with respect to the concordance model. Baryons and DM evolve differently, affecting the ratio of height between the odd and even peaks [22]. The lensing potential changes modify the lensing B-mode contribution [21].…”

Section: Constraints From Cmb Temperature Anisotropiesmentioning

confidence: 99%

Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures

et al. 2016

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Abstract. Models where Dark Matter and Dark Energy interact with each other have been proposed to solve the coincidence problem. We review the motivations underlying the need to introduce such interaction, its influence on the background dynamics and how it modifies the evolution of linear perturbations. We test models using the most recent observational data and we find that the interaction is compatible with the current astronomical and cosmological data. Finally, we describe the forthcoming data sets from current and future facilities that are being constructed or designed that will allow a clearer understanding of the physics of the dark sector.

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“…Non-standard gravitational scenarios are best inspected by analyzing the shape of large scale observables, such as the matter density power spectrum, the CMB angular power spectrum, the lensing spectrum, lensing Bmode contribution and the bi-spectrum. They can for instance change the lensing potential (Φ + Ψ) when additional perturbative terms are included [188], change the growth of structure modifying the Poisson equation and affect the shape of the temperature-temperature CMB power spectrum at low multipole-through the integrated Sachs-Wolfe (ISW) effect sourced bẏ Φ +Ψ [189,190], shift its high-peaks due to a modified expansion history [191] and change the ratio between odd and even peaks in models where DE is coupled to dark matter [192].…”

Section: Imprints On Cosmological Power Spectramentioning

confidence: 99%

Effective field theory of dark energy: A review

2020

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The discovery of cosmic acceleration has triggered a consistent body of theoretical work aimed at modeling its phenomenology and understanding its fundamental physical nature. In recent years, a powerful formalism that accomplishes both these goals has been developed, the so-called effective field theory of dark energy. It can capture the behavior of a wide class of modified gravity theories and classify them according to the imprints they leave on the smooth background expansion history of the Universe and on the evolution of linear perturbations. The effective field theory of dark energy is based on a Lagrangian description of cosmological perturbations which depends on a number of functions of time, some of which are non-minimal couplings representing genuine deviations from standard gravity. Such a formalism is thus particularly convenient to fit and interpret the wealth of new data that will be provided by future galaxy surveys. Despite its recent appearance, this formalism has already allowed a systematic investigation of what lies beyond the standard gravity landscape and provided a conspicuous amount of theoretical predictions and observational results. In this review, we report on these achievements. Conclusion and outlook 94Appendix A Acronyms and symbols 971. Scalar-tensor theoriesà la Brans-Dicke, hereafter dubbed Generalized

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Testing coupled dark energy with next-generation large-scale observations

Cited by 70 publications

References 87 publications

Planck2015 results

Planck2015 results

Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures

Effective field theory of dark energy: A review

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