Observational constraints on dark energy with a fast varying equation of state

Abstract

We place observational constraints on models with the late-time cosmic acceleration based on a number of parametrizations allowing fast transitions for the equation of state of dark energy. In addition to the model of Linder and Huterer where the dark energy equation of state $w$ monotonically grows or decreases in time, we propose two new parametrizations in which $w$ has an extremum. We carry out the likelihood analysis with the three parametrizations by using the observational data of supernovae type Ia, cosmic microwave background, and baryon acoustic oscillations. Although the transient cosmic acceleration models with fast transitions can give rise to the total chi square smaller than that in the $\Lambda$-Cold-Dark-Matter ($\Lambda$CDM) model, these models are not favored over $\Lambda$CDM when one uses the Akaike information criterion which penalizes the extra degrees of freedom present in the parametrizations.

10 pages, 5 figures

Cited by in corpus (36)

• Dark energy in Horndeski theories after GW170817: A review
• Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints
• Observational constraints on one-parameter dynamical dark-energy parametrizations and the $H_0$ tension
• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• Observational Constraints on Quintessence: Thawing, Tracker, and Scaling models
• Observational constraints on two cosmological models of $f(Q)$ theory
• A designer approach to $f(Q)$ gravity and cosmological implications
• An overview of what current data can (and cannot yet) say about evolving dark energy
• Observational Constraints on Oscillating Dark-Energy Parametrizations
• Reconstruction of the Dark Energy equation of state
• Constraining the dark energy equation of state using Bayes theorem and the Kullback-Leibler divergence
• Cosmological constraints on dark energy in $f(Q)$ gravity: A parametrized perspective
• Holographic Dark Energy from Fluid/Gravity Duality Constraint by Cosmological Observations
• Testing for dynamical dark energy models with redshift-space distortions
• A divergence-free parametrization for dynamical dark energy
• Testing an oscillatory behavior of dark energy
• New parametrization of the dark-energy equation of state with a single parameter
• Cosmographic Footprints of Dynamical Dark Energy
• The fate of bound systems through Sudden Future Singularities
• Exploring the cosmological consequences of JLA supernova data with improved flux-averaging technique
• Shape of Dark Energy: Constraining Its Evolution with a General Parametrization
• Neutrino generated dynamical dark energy with no dark energy field
• Shan--Chen interacting vacuum cosmology
• Implications of JLA data for $k-$essence model of dark energy with given equation of state
• Beyond Two Parameters: Revisiting Dark Energy with the Latest Cosmic Probes
• Comparison of piecewise-constant methods for dark energy
• Stress testing the dark energy equation of state imprint on supernova data
• Constraining Temporal Oscillations of Cosmological Parameters Using Type Ia Supernovae
• Revisiting CPL with sign-switching density: To cross or not to cross the NECB
• Unified dark fluid with fast transition: including entropic perturbations
• Investigating the Possibility of a Turning Point in the Dark Energy Equation of State
• A New Window on Dynamical Dark Energy: Combining DESI-DR2 BAO with future Gravitational Wave Observations
• Dynamical Oscillations in Dark Energy: Joint Constraints on the $w_{sin}$CDM Model from DESI, OHD, and Supernova Samples
• Generalized Holographic Cosmology: low-redshift observational constraint
• Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes
• Characterising Dark Energy through supernovae