Evolution of matter perturbations in the context of cosmic slowing down

Abstract

We investigate dynamical, time-evolving dark-energy models exhibiting phantom behaviour within Einstein gravity by analysing the evolution of matter perturbations. In particular, we consider five dark-energy parameterisations that predict a slowing down of the current cosmic acceleration. We examine the evolution of the growth index and its first derivative, as well as the combination parameter and the statefinder diagnostics, and compare their behaviour with that of the concordance $\Lambda$CDM model. For the parameter choices considered, the present-day values of the growth index and its first derivative are found to be compatible with ranges reported in previous phenomenological studies. The combination parameter is also found to differ from its $\Lambda$CDM value, while the statefinder parameters provide additional means of distinguishing the considered dynamical dark-energy scenarios from the concordance model. Our results illustrate the phenomenological signatures associated with these models and identify observables that may be useful for future observational tests. We stress, however, that the present analysis does not constitute a statistical model comparison or establish an observational preference for any of the considered dynamical dark-energy models over $\Lambda$CDM.

arXiv comment22 pages, 5 tables, 15 figures, to appear in MPLA

References in corpus (79)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Dynamics of dark energy
• f(R) Theories Of Gravity
• f(R) theories
• 4D Gravity on a Brane in 5D Minkowski Space
• The Cosmological Constant
• A 2.4% Determination of the Local Value of the Hubble Constant
• Essentials of k-essence
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Statefinder -- a new geometrical diagnostic of dark energy
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Disappearing cosmological constant in f(R) gravity
• Early Dark Energy Can Resolve The Hubble Tension
• Cluster Abundance Constraints on Quintessence Models
• Challenges for $\Lambda$CDM: An update
• Exploring the Expanding Universe and Dark Energy using the Statefinder Diagnostic
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Brane-world gravity
• Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant
• Cosmology with tachyon field as dark energy
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$
• Testing General Relativity in Cosmology
• WMAP constraints on low redshift evolution of dark energy
• Extended Gravity Cosmography
• Cosmography: Cosmology without the Einstein equations
• Dark energy two decades after: Observables, probes, consistency tests
• How to determine an effective potential for a variable cosmological term
• A Lower Growth Rate from Recent Redshift Space Distortion Measurements than Expected from Planck
• Brane cosmology: an introduction
• Does the Hubble constant tension call for new physics?
• Observational constraints on low redshift evolution of dark energy: How consistent are different observations?
• A parametric model for dark energy
• Evolution of the $f{\sigma }_8$ tension with the Planck15/$\Lambda$CDM determination and implications for modified gravity theories
• Cosmography and constraints on the equation of state of the Universe in various parametrizations
• Tension and constraints on modified gravity parametrizations of $G_{\text{eff}}(z)$ from growth rate and Planck data
• Prospects for resolving the Hubble constant tension with standard sirens
• Measuring and Understanding the Universe
• Testing LCDM with the Growth Function δ(a): Current Constraints
• Viable f(T) models are practically indistinguishable from LCDM
• Separating Dark Physics from Physical Darkness: Minimalist Modified Gravity vs. Dark Energy
• $H_0$ Tension, Phantom Dark Energy and Cosmological Parameter Degeneracies
• On the theory and applications of modern cosmography
• On the growth of linear perturbations
• Structure formation in the presence of dark energy perturbations
• On model selection forecasting, Dark Energy and modified gravity
• Cosmographic analysis with Chebyshev polynomials
• Observational constraints on viable f(R) parametrizations with geometrical and dynamical probes
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• Observational constraints on the linear fluctuation growth rate
• Anomalies in Physical Cosmology
• Constraints on dark energy with the LOSS SN Ia sample
• Emerging spatial curvature can resolve the tension between high-redshift CMB and low-redshift distance ladder measurements of the Hubble constant
• Tension of the $E_G$ statistic and RSD data with Planck/$\Lambda$CDM and implications for weakening gravity
• The past and future dynamics of quintom dark energy models
• Cosmic slowing down of acceleration for several dark energy parametrizations
• Neutrino Mass, Dark Energy, and the Linear Growth Factor
• Conjoined constraints on modified gravity from the expansion history and cosmic growth
• SN and BAO constraints on (new) polynomial dark energy parametrizations: current results and forecasts
• Can scale-dependent cosmology alleviate the $H_0$ tension?
• A New Class of Parametrization for Dark Energy without Divergence
• Cosmological constraints of phantom dark energy models
• Hints of Modified Gravity in Cosmos and in the Lab?
• Constraints on the transition redshift from the calibrated Gamma-ray Burst $E_{\mathrm{p}}$-$E_{\mathrm{iso}}$ correlation
• Cosmological perturbations in an effective and genuinely phantom dark energy Universe
• Dynamical systems methods and statefinder diagnostic of interacting vacuum energy models
• Statefinder diagnostic and constraints on the Palatini f(R) gravity theories
• Growth index and statefinder diagnostic of Oscillating Dark Energy
• Evolution of Dark Energy Perturbations in Scalar-Tensor Cosmologies
• Statefinder parameters in two dark energy models
• Late-time acceleration with a scalar field source: Observational constraints and statefinder diagnostics
• Observational Constraints on Growth Index with Cosmography
• Stability of cosmic structures in scalar-tensor theories of gravity
• Growth of structures and redshift-space distortion data in scale-dependent gravity
• Measuring the matter fluctuations in the Local Universe with the ALFALFA catalog
• Scalar field descriptions of two dark energy models
• Observational constraints on the growth index parameters in $f(Q)$ gravity