Revisiting the epoch of cosmic acceleration

Abstract

We revisit the epoch of cosmic speed-up characterized by the redshift of transition from a decelerated to an accelerated phase. This redshift is termed the transition redshift ($z_t$). We use the spatially Flat and Non-Flat variants of the most common $\Lambda$CDM and XCDM models to put constraints on the transition redshift along with the other model parameters. The data for this analysis comes from the recent and updated Pantheon+ Supernova dataset and the Hubble parameter measurements obtained from Cosmic Chronometers. We consider both datasets with their respective covariance matrices incorporating all kinds of statistical and systematic uncertainties. We observe that using the combined datasets of H(z) and SNe, the best fit value of transition redshift lies in the range $0.61<z_t<0.82$ for all four dark energy models. Incidentally, we observe a positive curvature for the Non-Flat models and correlations between several model parameters.

16 pages, 4 Figures, 3 Tables, Accepted for publication in Research in Astronomy & Astrophysics

References in corpus (11)

• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• Cosmographic bounds on the cosmological deceleration-acceleration transition redshift in $f(\mathcal{R})$ gravity
• Dynamical Dark Energy or Simply Cosmic Curvature?
• A new parametrization of Hubble parameter in $f(Q)$ gravity
• Implication of Dark Energy Parametrizations on the Determination of the Curvature of the Universe
• Constraints on the transition redshift from the calibrated Gamma-ray Burst $E_{\mathrm{p}}$-$E_{\mathrm{iso}}$ correlation
• When Did Cosmic Acceleration Start ?
• A cosmographic analysis of the transition to acceleration using SN-Ia and BAO
• Constraining Dark Energy and Cosmological Transition Redshift with Type Ia Supernovae
• Uncertainty on determining the dark energy equation of state due to the spatial curvature
• Constraints on the Transition Redshift using Hubble Phase Space Portrait

Cited by in corpus (7)

• Gamma Rays Bursts: A Viable Cosmological Probe?
• Effect of extinction on quasar luminosity distances determined from UV and X-ray flux measurements
• Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from MgII and CIV reverberation-mapped quasar data
• Testing the standardizability of, and deriving cosmological constraints from, a new Amati-correlated gamma-ray burst data compilation
• Low- and high-redshift H II starburst galaxies obey different luminosity-velocity dispersion relations
• Testing the phenomenological interacting dark energy model with gamma-ray bursts and Pantheon+ type Ia supernovae
• Testing the consistency of new Amati-correlated gamma-ray burst dataset cosmological constraints with those from better-established cosmological data