Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes

Abstract

This study explores the possibility of a time-varying dark energy (DE) equation of state (EoS) deviating from -1. We employ a comprehensive dataset of usual astronomical probes (Type Ia supernovae, baryon acoustic oscillations, Big Bang nucleosynthesis, Hubble data, and Planck 2018 CMB) alongside future mock gravitational wave (GW) distance measurements from the Einstein Telescope. We utilize the Pad'e approximation, a versatile framework encompassing well-known DE models like constant EoS, Chevallier-Polarski-Linder parametrization and other time-evolving DE parametrizations. Within Pad'e parametrization, we examine three specific forms (Pad'e-I, SPad'e-I, Pad'e-II) applied to both spatially flat and non-flat universes. Pad'e-II exhibits particularly interesting features in terms of the evidence of dynamical DE at many standard deviations. Our results can be summarized as follows. Flat Universe: When analyzing the combined dataset of standard probes (including CMB) with Pad'e-II in a flat universe, we find a strong preference (6.4σ) for a dynamical (time-varying) DE EoS. This preference remains significant (4.7σ) even when incorporating future GW data. Non-Flat Universe: In a non-flat universe, the combined standard datasets (without or with CMB) also indicate dynamical DE EoS at a high confidence level (6.2σ and 6.4σ, respectively). The addition of GW data slightly reduces the evidence (3.8σ and 5.1σ, respectively), but the preference persists. These results collectively suggest a robust case for dynamical DE in the dark sector. While a non-flat universe is not strongly favored, Pad'e-II hints at a possible closed universe when CMB data is included (with or without GW data).

8 figures and 4 tables, accepted for publication in APJ

References in corpus (63)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Pantheon+ Analysis: Cosmological Constraints
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Challenges for $\Lambda$CDM: An update
• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?
• Scientific Objectives of Einstein Telescope
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Are f(R) dark energy models cosmologically viable ?
• WMAP constraints on low redshift evolution of dark energy
• Indications of a late-time interaction in the dark sector
• Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• A parametric model for dark energy
• Determination of Dark Energy by the Einstein Telescope: Comparing with CMB, BAO and SNIa Observations
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope
• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements
• Precision cosmology with Padé rational approximations: theoretical predictions versus observational limits
• Reducing the weak lensing noise for the gravitational wave Hubble diagram using the non-Gaussianity of the magnification distribution
• Scant evidence for thawing quintessence
• Updated Cosmological Constraints in Extended Parameter Space with Planck PR4, DESI Baryon Acoustic Oscillations, and Supernovae: Dynamical Dark Energy, Neutrino Masses, Lensing Anomaly, and the Hubble Tension
• Dynamical dark energy after Planck CMB final release and $H_0$ tension
• Is exponential gravity a viable description for the whole cosmological history?
• Searching for dark matter - dark energy interactions: going beyond the conformal case
• An overview of what current data can (and cannot yet) say about evolving dark energy
• Testing coupled dark energy models with their cosmological background evolution
• The state of the dark energy equation of state circa 2023
• Cosmology in Extended Parameter Space with DESI Data Release 2 Baryon Acoustic Oscillations: A 2$\sigma$+ Detection of Nonzero Neutrino Masses with an Update on Dynamical Dark Energy and Lensing Anomaly
• A Consistent View of Interacting Dark Energy from Multiple CMB Probes
• Robustness of dark energy phenomenology across different parameterizations
• Revealing the effects of curvature on the cosmological models
• Dynamical Dark Energy Beyond Planck? Constraints from multiple CMB probes, DESI BAO and Type-Ia Supernovae
• Generalized Emergent Dark Energy Model and the Hubble Constant Tension
• Forecasting constraints on deviations from general relativity in $f(Q)$ gravity with standard sirens
• Cosmography approach to dark energy cosmologies: new constrains using the Hubble diagrams of supernovae, quasars and gamma-ray bursts
• Implication of Dark Energy Parametrizations on the Determination of the Curvature of the Universe
• The DESI DR1/DR2 evidence for dynamical dark energy is biased by low-redshift supernovae
• Comparison between different methods of model selection in cosmology
• Testing the equation of state for viscous dark energy
• A Bayesian comparison between $\Lambda$CDM and phenomenologically emergent dark energy models
• Probing the imprints of generalized interacting dark energy on the growth of perturbations
• Tightening the reins on non-minimal dark sector physics: Interacting Dark Energy with dynamical and non-dynamical equation of state
• Dynamical symmetries and observational constraints in scalar field cosmology
• Quantifying the global "CMB tension" between the Atacama Cosmology Telescope and the Planck satellite in extended models of cosmology
• Prospects for probing the interaction between dark energy and dark matter using gravitational-wave dark sirens with neutron star tidal deformation
• Minimal dark energy: key to sterile neutrino and Hubble constant tensions?
• Dynamical dark energy confronted with multiple CMB missions
• Gravitational wave propagation in $f(R)$ models: New parametrizations and observational constraints
• Observational Constraints on Dark Energy Models with $\Lambda$ as an Equilibrium Point
• Non-parametric dark energy reconstruction using the tomographic Alcock-Paczynski test
• New late-time constraints on $f(R)$ gravity
• Testing an oscillatory behavior of dark energy
• Testing f(R) gravity with the simulated data of gravitational waves from the Einstein Telescope
• Running vacuum versus Holographic dark energy: a cosmographic comparison
• Observational constraints on the oscillating dark energy cosmologies
• Oscillating dark energy in light of the latest observations and its impact on the Hubble tension
• Structure formation in dark energy cosmologies described by PADE parameterization
• Reducing the Impact of Weak-lensing Errors on Gravitational-wave Standard Sirens
• Prospects of constraining $f(T)$ gravity with the third-generation gravitational-wave detectors
• Exploring bulk viscous unified scenarios with Gravitational Waves Standard Sirens

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