The role of curvature in the slowing down acceleration scenario

Abstract

We introduce the curvature ${\Omega }_k$ as a new free parameter in the Bayesian analysis using SNIa, BAO and CMB data, in a model with variable equation of state parameter $w(z)$. We compare the results using both the Constitution and Union 2 data sets, and also study possible low redshift transitions in the deceleration parameter $q(z)$. We found that, incorporating ${\Omega }_k$ in the analysis, it is possible to make all the three observational probes consistent using both SNIa data sets. Our results support dark energy evolution at small redshift, and show that the tension between small and large redshift probes is ameliorated. However, although the tension decreases, it is still not possible to find a consensus set of parameters that fit all the three data set using the Chevalier-Polarski-Linder CPL parametrization.

6 pages, 8 figures

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Cited by in corpus (13)

• Three thermodynamically-based parametrizations of the deceleration parameter
• Cosmic slowing down of acceleration for several dark energy parametrizations
• Test of the cosmic evolution using Gaussian processes
• Testing dark energy models with a new sample of strong-lensing systems
• A comprehensive investigation on the slowing down of cosmic acceleration
• Cosmic slowing down of acceleration using $f_{gas}$
• Exploring hints for dark energy density evolution in light of recent data
• Testing cosmic acceleration for $w(z)$ parameterizations using $f_{gas}$ measurements in galaxy clusters
• An exponential equation of state of dark energy in the light of 2018 CMB Planck data
• Asymmetry in the reconstructed deceleration parameter
• Revisiting cosmic acceleration with DESI BAO
• Physical condition for the slowing down of cosmic acceleration
• Re-examining the role of curvature in the slowing down acceleration scenario