A model independent parametrization of the late time cosmic
acceleration: constraints on the parameters from recent observations
B. Dinda. (2019)cite arxiv:1904.10418Comment: 7 pages, 5 figures, and a Table.
Abstract
In this work, we have considered a model independent approach to study the
nature of the late time cosmic acceleration. We have used the Pade
approximation to parametrize the comoving distance. Consequently, from this
comoving distance, we derive a parameterization for the Hubble parameter. Our
parametrization is completely analytic and valid for late-time and matter
dominated eras only. This parametrization possesses sub-percentage accuracy
compared to any arbitrary cosmological model or parametrization up to matter
dominated era. Using this parametrization, we put constraints on the parameters
from recent low redshift cosmological observations including Planck 2018
results. Our results show that the $Łambda$CDM model is 1$\sigma$ away for
redshift $z<1.5$. We also find that the dynamical dark energy models are
preferred for redshift $z<0.5$.
Description
A model independent parametrization of the late time cosmic acceleration: constraints on the parameters from recent observations
%0 Generic
%1 dinda2019model
%A Dinda, Bikash R.
%D 2019
%K tifr
%T A model independent parametrization of the late time cosmic
acceleration: constraints on the parameters from recent observations
%U http://arxiv.org/abs/1904.10418
%X In this work, we have considered a model independent approach to study the
nature of the late time cosmic acceleration. We have used the Pade
approximation to parametrize the comoving distance. Consequently, from this
comoving distance, we derive a parameterization for the Hubble parameter. Our
parametrization is completely analytic and valid for late-time and matter
dominated eras only. This parametrization possesses sub-percentage accuracy
compared to any arbitrary cosmological model or parametrization up to matter
dominated era. Using this parametrization, we put constraints on the parameters
from recent low redshift cosmological observations including Planck 2018
results. Our results show that the $Łambda$CDM model is 1$\sigma$ away for
redshift $z<1.5$. We also find that the dynamical dark energy models are
preferred for redshift $z<0.5$.
@misc{dinda2019model,
abstract = {In this work, we have considered a model independent approach to study the
nature of the late time cosmic acceleration. We have used the Pade
approximation to parametrize the comoving distance. Consequently, from this
comoving distance, we derive a parameterization for the Hubble parameter. Our
parametrization is completely analytic and valid for late-time and matter
dominated eras only. This parametrization possesses sub-percentage accuracy
compared to any arbitrary cosmological model or parametrization up to matter
dominated era. Using this parametrization, we put constraints on the parameters
from recent low redshift cosmological observations including Planck 2018
results. Our results show that the $\Lambda$CDM model is 1$\sigma$ away for
redshift $z<1.5$. We also find that the dynamical dark energy models are
preferred for redshift $z<0.5$.},
added-at = {2019-04-25T05:51:28.000+0200},
author = {Dinda, Bikash R.},
biburl = {https://www.bibsonomy.org/bibtex/261b9c5ca64f64e1eb77a82cb66c86988/citekhatri},
description = {A model independent parametrization of the late time cosmic acceleration: constraints on the parameters from recent observations},
interhash = {a02d1993482d6b4de9c51ea458b38e7f},
intrahash = {61b9c5ca64f64e1eb77a82cb66c86988},
keywords = {tifr},
note = {cite arxiv:1904.10418Comment: 7 pages, 5 figures, and a Table},
timestamp = {2019-04-25T05:51:28.000+0200},
title = {A model independent parametrization of the late time cosmic
acceleration: constraints on the parameters from recent observations},
url = {http://arxiv.org/abs/1904.10418},
year = 2019
}