Coupled Quintessence
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The cosmological consequences of such a coupled quintessence (CQ) model, assuming an exponential potential and a linear coupling, were investigated in this article, where the authors evaluated the density perturbations on the cosmic microwave background and on the galaxy distribution at the present and derived bounds on the coupling constant.Abstract:
A new component of the cosmic medium, a light scalar field or ''quintessence '', has been proposed recently to explain cosmic acceleration with a dynamical cosmological constant Such a field is expected to be coupled explicitely to ordinary matter, unless some unknown symmetry prevents it I investigate the cosmological consequences of such a coupled quintessence (CQ) model, assuming an exponential potential and a linear coupling This model is conformally equivalent to Brans-Dicke Lagrangians with power-law potential I evaluate the density perturbations on the cosmic microwave background and on the galaxy distribution at the present and derive bounds on the coupling constant from the comparison with observational data A novel feature of CQ is that during the matter dominated era the scalar field has a finite and almost constant energy density This epoch, denoted as $\phi $MDE, is responsible of several differences with respect to uncoupled quintessence: the multipole spectrum of the microwave background is tilted at large angles, the acoustic peaks are shifted, their amplitude is changed, and the present 8Mpc$/h$ density variance is diminished The present data constrain the dimensionless coupling constant to $|\beta |\leq 01$read more
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ISW-LSS cross-correlation in coupled Dark Energy models with massive neutrinos
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Finding structure in the dark: coupled dark energy, weak lensing, and the mildly nonlinear regime
TL;DR: In this article, the authors reexamine interactions between the dark sectors of cosmology, with a focus on robust constraints that can be obtained using only mildly nonlinear scales, and show that lensing and clustering of galaxies in combination with the Cosmic Microwave Background (CMB) is capable of probing the dark sector coupling to the few percent level.
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Non-virialized clusters for detection of dark energy-dark matter interaction
TL;DR: In this article, a simple model of interacting dark sector, the Layzer-Irvine equation for dynamical virial evolution, was used to evaluate the departure from virial equilibrium in order to detect, in that balance, effects from a Dark matter-Dark energy interaction.
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Dynamical systems methods and statender diagnostic of interacting vacuum energy models
TL;DR: In this paper, three interacting dark energy models within the framework of four-dimensional General Relativity and a spatially flat universe are studied. And the authors show that significant differences between the models are observed as the strength of the interaction term increases.
Journal ArticleDOI
Isw-lss cross-correlation in coupled dark energy models with massive neutrinos
Roberto Mainini,David F. Mota +1 more
TL;DR: In this paper, the authors provide an exhaustive analysis of the Integrated Sachs-Wolfe (ISW) effect in the context of coupled dark energy cosmologies where a component of massive neutrinos is also present.
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