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Coupled Quintessence
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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 $|\beta |\leq 0.1$.
Forward citations
Cited by 48 Pith papers
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Phenomenology of an Open Effective Field Theory of Dark Energy
A minimal open EFT for late-time acceleration fits BAO observations without NEC violations and predicts dissipative suppression of GW luminosity distance, modified Bardeen potentials with gravitational slip, and enhan...
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Constraining interacting dark energy models with black hole superradiance
Black hole superradiance constrains the coupling strength in interacting dark energy-dark matter models through modifications to the effective mass of ultralight bosons in two scenarios.
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The silent dark sector: a field-theory approach to unified dark fluids with vanishing speed of sound
All vanishing-speed-of-sound TDiff scalar theories reduce to a two-parameter mimetic action describing the dark sector as interacting dust plus vacuum; a quadratic-potential example tracks the DESI CPL background.
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Breaking the Dark Sector Degeneracy with Nonparametric Expansion--Growth Reconstruction
Joint nonparametric expansion–growth reconstruction finds no significant dark-sector interaction or dark-energy dynamics, remaining consistent with ΛCDM over 0≲z≲2.
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Non-linear Structure Formation in Planck+DESI Favoured Interacting Dark Energy Cosmologies
N-body simulations of IDE with Q=ξHρ_x show scale-dependent deviations in the matter power spectrum, density morphology, and halo abundance that standard ΛCDM-calibrated prescriptions cannot reproduce.
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Revisiting observational constraints on coupled exponential quintessence with energy and momentum transfers: degeneracy with massive neutrinos
Allowing the neutrino mass to vary removes the 2σ evidence for momentum transfer between dark energy and dark matter in coupled quintessence, via a degeneracy with the energy-exchange coupling.
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Deviations from the von Laue condition: Implications for the on-shell Lagrangian of particles and fluids
Deviations from the von Laue condition inside a particle are bounded by its outer energy fraction, so fluid on-shell Lagrangians are nearly equal to the stress-tensor trace except at extreme densities.
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Upper limits on dark energy-dark matter interaction from DESI DR2 in a field-theoretic analysis
A field-theoretic calculation finds that dark energy and dark matter interact only very weakly, and DESI data rule out the strong-interaction regime that would change quintessence behavior.
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Redshift space distortions in the presence of non-minimally coupled dark matter
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Coupled quintessence from an axion dark sector
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The cosmology of long range Yukawa interactions in general backgrounds
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Dissipative Dark Energy can explain the DESI phantom crossing
Weakly dissipative quintessence explains DESI phantom crossing in dark energy without pathological dynamics.
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Matter influence on large-scale scalar dynamics
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Onset of spontaneous scalarization in dark matter stars
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Non-minimal fluid Lagrangian couplings
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Generalizing the CPL Parametrization through Dark Sector Interaction
Generalized interacting dark energy models with constant or dynamical couplings yield analytical density expressions but are not preferred over LambdaCDM by Bayesian evidence from DESI, Pantheon+, and CMB data.
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Accelerating scaling solutions from dark matter particle creation
Accelerating scaling attractors without dark energy appear only when the interaction is controlled by DM density and energy flows from DM to a barotropic fluid.
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Robust Preference for Dark Sector Interactions
Interacting dark matter–dark energy models fit DESI BAO and CMB data as well as evolving-dark-energy (CPL) models, with a coupling preference that persists under DES-Dovekie supernova recalibration.
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Direct detection of solar chameleons with electron recoil data from XENONnT
XENONnT electron-recoil data bound solar chameleons to log10 β_eff < −6.9, independent of the potential index n for inverse power-law chameleons at the dark-energy scale.
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Resolving the Planck-DESI tension by nonminimally coupled quintessence
Non-minimally coupled quintessence resolves the Planck-DESI Ω_m tension at >3σ while the effective equation of state stays above w=-1 and other tensions on neutrino mass and growth rate are relieved.
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Weinberg's theorem, phantom crossing and screening
Graviton-loop-induced screening forces single-field dilaton and chameleon dark energy models to keep their equation of state near -1, making observable phantom crossing impossible in this class.
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Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI
Two phenomenological dark matter creation rates can reproduce the accelerated expansion of the universe and fit current background data as well as or slightly better than LambdaCDM for some DESI-based data combinations.
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About electroweak domain walls in Majoron models
Electroweak instantons alone do not produce Majoron domain walls; a tiny instanton mass from B+L breaking is cosmologically negligible and can act as a bias or dark energy.
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Robustness of dark energy phenomenology across different parameterizations
The viability of minimally and non-minimally coupled quintessence models is robust across CPL, JBP, BA, and EXP parameterizations, with all four reproducing the models' predicted observables accurately.
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Interacting phantom dark energy: new accelerating scaling attractors
Interacting phantom dark energy with two previously underused potentials admits new stable late-time accelerating solutions in which dark matter and dark energy coexist.
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Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions
An interacting dark energy model with coupling proportional to the dark energy density alleviates the H0 and S8 tensions in Planck 2018 data but is not preferred once BAO and supernova data are included.
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Resolving Hubble Tension with Quintom Dark Energy Model
A small negative-density component with equation of state 1/3≤w≤1 can lift H0 from 67.4 to about 74, but the coupled quintom model realizing it either misses the CMB peak or gives H0=68.55.
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Fractional Dark Matter decay: cosmological imprints and observational constraints
Cosmological data limit a pre-recombination decaying dark matter fraction to at most about 2.7%, and future kSZ measurements could provide an independent test.
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Probing the independence within the dark sector in the fluid approximation
Current cosmological data show no statistically significant sign of an interaction between cold dark matter and dark energy, with LambdaCDM preferred, and future LSST and DESI data could constrain such a coupling at 2...
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The Status of Single Scalar Field Dark Energy
Cosmological data can constrain only a handful of EFT parameters for single-scalar dark energy; extended models show modest preference over Λ but remain underdetermined and challenged by fifth forces and screening.
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Generalizing the interacting dilatonic ghost condensate as a dark energy model
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CMB Bounds on Primordial Black Holes via Radiation Capture
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Neutrino mass constraints in interacting dark energy models after DESI DR2
Upper bounds on total neutrino mass in four phenomenological interacting dark energy models are derived from DESI DR2 BAO plus CMB and SNIa data, showing strong dependence on the interaction term form and statistical ...
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Gaussian Process Reconstruction of Cosmological Parameters with Gravitational Wave Sirens using Machine Learning
Gaussian Process Regression on mock GW siren catalogues reconstructs comoving distance and derivatives, showing that derivative diagnostics at specific redshifts best separate cosmological models while background data...
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Dark Energy Is Not That Into You: Variable Couplings after DESI DR2 BAO
With DESI DR2 data, one interacting dark sector model with a time-dependent coupling shows a nonzero coupling at more than 95% CL, but Bayesian evidence still favors Lambda-CDM.
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Averaging Dynamics of Scalar Field-Matter Interacting Models in Anisotropic Universes: The Locally Rotationally Symmetric Bianchi I Spacetime
The authors apply averaging methods to classify late-time attractors for nine interacting dark sector models in Bianchi I cosmology, but the general interaction formula does not match the specific models analyzed.
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Two Dynamical Scenarios for Binned Master Sample Interpretation
A model where dark energy is created by gravity and interacts with matter can mimic the decreasing running Hubble constant seen in binned supernovae, but only after its free parameter is tuned to that same trend.
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Solving an Interacting Quintessence Model with a Sound Horizon Initial Condition and its Observational Constraints
An interacting quintessence model with initial conditions set by the CMB sound horizon angle increases H0 with coupling strength, but observational constraints show it does not resolve the H0 or S8 tensions.
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Extended Dark Energy analysis using DESI DR2 BAO measurements
Extended analysis of DESI DR2 data confirms robust evidence for dynamical dark energy with phantom crossing preference, stable under parametric and non-parametric modeling.
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An overview of what current data can (and cannot yet) say about evolving dark energy
The apparent preference for evolving dark energy depends strongly on which supernova catalog and which BAO survey are used, and is not robust across all independent data combinations.
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Quantifying the impacts of future gravitational-wave data on constraining interacting dark energy
Adding 1000 simulated Einstein Telescope standard sirens to current CMB, BAO, and supernova data would tighten H0 and matter density constraints by factors of 2 to 3 in four interacting dark energy models, with modest...
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Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
Review of DESI evidence for dynamical dark energy, its dependence on parametrization and datasets, and alternative beyond-LambdaCDM interpretations that may address cosmological tensions.
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Dissipative Cosmology and the Nature of Dark Energy: Insights from Bulk Viscosity with DESI DR2 observations
Bulk viscous fluid models for dark energy yield improved fits to supernova, BAO, and CMB data over LambdaCDM, especially in the interacting non-minimal case.
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Effective Phantom Dark Energy: What Cosmological Reconstruction Does and Does Not Imply
Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.
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Breaking Free from the Swampland of Impossible Universes through the DESI Portal
DESI data indicating evolving dark energy may allow string theory to describe observed universes without violating swampland constraints on constant dark energy.
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A short review on Quintom dark energy theory
Quintom dark energy models permit the equation of state to cross w=-1, supporting bouncing cosmologies and CMB-based tests of dark energy nature.
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Dark energy and cosmic acceleration
A review chapter summarizing the history, theory, and current observations of dark energy, presenting no new research results.
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