Tension Reduction between Planck data and LSS by Dynamical Dark Energy Model

Document Type : Original Scientific Paper

Authors

1 Department of Physics, University of Kashan,Kashan, I. R. Iran

2 Ibn-Sina Laboratory, Shahid Beheshti University, Velenjak, Tehran 19839, Iran

3 Department of Physics, Shahid Beheshti University, Velenjak, Tehran 19839, Iran

Abstract

In this paper, we consider the dynamical dark energy model (Feng model) to reveal the discrepancy between CMB and LSS data raised by ΛCDM model. In order to constrained free parameters, we utilize two combined sets namely the Planck TT 2015+Pol+BAO and the WL+RSD. We find that, there is a tension between the best fit values for both σ8 and H0 derived by the early and late time observations in the context of ΛCDM model, while the mentioned discrepancy is alleviated in the Feng model. Two dimensional likelihood analysis demonstrate that including dynamical dark energy model alleviates H0 − Ωm and σ8 − Ωm tension from 2σ to 1σ confidence level compared to that of given for ΛCDM. Besides these, the models satisfy fσ8 data in 0 < z < 0.4 redshift bin but for z > 0.4, the models behave differently rather than data for both data sets.
 
 

Keywords


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