Evolution of density perturbations in decaying vacuum cosmology

Abstract

We study cosmological perturbations in the context of an interacting dark energy model, in which the cosmological term decays linearly with the Hubble parameter, with concomitant matter production. A previous joint analysis of the redshift-distance relation for type Ia supernovas, baryonic acoustic oscillations, and the position of the first peak in the anisotropy spectrum of the cosmic microwave background has led to acceptable values for the cosmological parameters. Here we present our analysis of small perturbations, under the assumption that the cosmological term, and therefore the matter production, are strictly homogeneous. Such a homogeneous production tends to dilute the matter contrast, leading to a late-time suppression in the power spectrum. Nevertheless, an excellent agreement with the observational data can be achieved by using a higher matter density as compared to the concordance value previously obtained. This may indicate that our hypothesis of homogeneous matter production must be relaxed by allowing perturbations in the interacting cosmological term.

Revised version. To appear in Physical Review D

References in corpus (40)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The Cosmological Constant and Dark Energy
• Cosmological Constant - the Weight of the Vacuum
• The Case for a Positive Cosmological Lambda-term
• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications
• Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
• MAXIMA-1: A Measurement of the Cosmic Microwave Background Anisotropy on angular scales of 10 arcminutes to 5 degrees
• Transition of the dark energy equation of state in an interacting holographic dark energy model
• Galaxy Cluster Virial Masses and Omega
• The end of unified dark matter?
• Constraints on the interacting holographic dark energy model
• Constraints on the generalized Chaplygin gas from supernovae observations
• Cosmologies with Energy Exchange
• The White Dwarf Cooling Sequence of the Globular Cluster Messier 4
• Density perturbations in an Universe dominated by the Chaplygin gas
• Cosmological consequences of a Chaplygin gas dark energy
• Holography and Variable Cosmological Constant
• Interacting Dark Energy and Dark Matter: observational Constraints from Cosmological Parameters
• Running G and Λat low energies from physics at M_X: possible cosmological and astrophysical implications
• Bulk Viscous Cosmology
• Testing the viability of the interacting holographic dark energy model by using combined observational constraints
• First Intrinsic Anisotropy Observations with the Cosmic Background Imager
• Scaling Cosmology
• Interpreting Cosmological Vacuum Decay
• A cosmological constant from the QCD trace anomaly?
• Friedmann cosmology with decaying vacuum density
• Non-Vacuum Initial States for Cosmological Perturbations of Quantum-Mechanical Origin
• An estimate of Ω_m without priors
• Decay of cosmological constant as Bose condensate evaporation
• The Running of the Cosmological and the Newton Constant controlled by the Cosmological Event Horizon
• The Case for Omega_M = 0.33 +/- 0.035
• Density Perturbations for Running Cosmological Constant
• Supernova constraints on decaying vacuum cosmology
• Studying the decay of the vacuum energy with the observed density fluctuation spectrum
• Effective growth of matter density fluctuations in the running LCDM and LXCDM models
• On the vacuum entropy and the cosmological constant
• From de Sitter to de Sitter: A non-singular inflationary universe driven by vacuum
• Non-singular inflation with vacuum decay

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• Hubble expansion & Structure Formation in Time Varying Vacuum Models
• Viscous dark fluid universe
• Dark energy perturbations and cosmic coincidence
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• Gluonic vacuum, q-theory, and the cosmological constant
• Entropic-force dark energy reconsidered
• Non-adiabatic dark fluid cosmology
• Observational constraints on late-time Lambda(t) cosmology
• A cosmological concordance model with dynamical vacuum term
• Tests of the CMB temperature-redshift relation, CMB spectral distortions and why adiabatic photon production is hard
• Cosmic perturbations with running G and Lambda
• Observational tests of non-adiabatic Chaplygin gas
• Cosmological implications and structure formation from a time varying vacuum
• Matter Power Spectrum for the Generalized Chaplygin Gas Model: The Newtonian Approach
• Observational tests for Λ(t)CDM cosmology
• Non-adiabatic perturbations in decaying vacuum cosmology
• Evolution of density perturbations in decaying vacuum cosmology: The case of non-zero perturbations in the cosmological term
• Non-adiabatic Chaplygin gas
• On dark degeneracy and interacting models
• Large scale structure and ISW effect in decaying vacuum cosmology
• Perturbations for transient acceleration
• Scalar-Tensor gravity with system-dependent potential and its relation with Renormalization Group extended General Relativity
• On vacuum density, the initial singularity and dark energy
• Constraints from growth-rate data on some coupled dark energy models mimicking a $\Lambda CDM$ expansion
• Number Counts and Dynamical Vacuum Cosmologies
• Running Vacuum Cosmological Models: Linear Scalar Perturbations
• GRB Hubble diagram and constraints on a Λ(t)CDM model
• Baryonic matter perturbations in decaying vacuum cosmology
• Density perturbations in decaying holographic dark energy models
• Running cosmological constant with observational tests
• Perturbations in the interacting vacuum
• Cosmological framework for renormalization group extended gravity at the action level
• Will-Nordtvedt PPN formalism applied to renormalization group extensions of general relativity
• Observational constraints on running vacuum model
• Interactions in the dark sector of the Universe
• Primordial Gravitational Waves in Running Vacuum Cosmologies
• Matter density perturbation and power spectrum in running vacuum model
• Viscous fluid dynamics with decaying vacuum energy density
• Deflation of the cosmological constant associated with inflation and dark energy
• A coupled vacuum energy model producing endless alternated phases of accelerated and decelerated expansion
• Newtonian Approach to the Matter Power Spectrum of the Generalized Chaplygin Gas