Sardar, G.; Chakraborty, S. Observational Constraints on Modified CPL Models for Dark Energy. International Journal of Geometric Methods in Modern Physics 2023, doi:10.1142/s0219887824500506.
Sardar, G.; Chakraborty, S. Observational Constraints on Modified CPL Models for Dark Energy. International Journal of Geometric Methods in Modern Physics 2023, doi:10.1142/s0219887824500506.
Sardar, G.; Chakraborty, S. Observational Constraints on Modified CPL Models for Dark Energy. International Journal of Geometric Methods in Modern Physics 2023, doi:10.1142/s0219887824500506.
Sardar, G.; Chakraborty, S. Observational Constraints on Modified CPL Models for Dark Energy. International Journal of Geometric Methods in Modern Physics 2023, doi:10.1142/s0219887824500506.
Abstract
In the present work we consider two modified Chevallier-Polarski-Linder (CPL) models in the background of homogeneous and isotropic FLRW space-time, namely (i) the generalized CPL model (Model I) and (ii) the logarithmic form of the the equation of state for the dark energy. From the observational data sets ((Pantheon+)+BAO+HST), we find that at the present epoch (redshift $z=0$), the equation of state for the dark energy converges almost at the same value $\omega_{fld}\approx -0.86$ and the variation of $\omega_{fld}(z)$ with respect to the redshift parameter is very small for both models.
we also find that the present value of the Hubble parameter $H_0$ is almost same for both the models.
Finally, we compare the models in the light of Akaike, Bayesian Information Criterion (BIC) and Bayesian Evidence. However, we find that Model II is better compared to the Model I from the estimated value of the deceleration parameter.
Keywords
dark energy; CPL model; observational analysis
Subject
Physical Sciences, Applied Physics
Copyright:
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