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Title: Constraints on a generalized deceleration parameter from cosmic chronometers

Abstract: In this paper, we have proposed a generalized parametrization for the deceleration parameter $q$ in order to study the evolutionary history of the universe. We have shown that the proposed model can reproduce three well known $q$-parametrized models for some specific values of the model parameter $\alpha$. We have used the latest compilation of the Hubble parameter measurements obtained from the cosmic chronometer (CC) method (in combination with the local value of the Hubble constant $H_{0}$) and the Type Ia supernova (SNIa) data to place constraints on the parameters of the model for different values of $\alpha$. We have found that the resulting constraints on the deceleration parameter and the dark energy equation of state support the $\Lambda$CDM model within $1\sigma$ confidence level at the present epoch.
 Comments: 9 pages, 5 figures, minor change in title, new references added, revised version accepted for publication in MPLA Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cite as: arXiv:1702.04916 [gr-qc] (or arXiv:1702.04916v2 [gr-qc] for this version)

Submission history

From: Abdulla Al Mamon [view email]
[v1] Thu, 16 Feb 2017 10:34:17 GMT (1905kb)
[v2] Fri, 16 Mar 2018 19:36:04 GMT (2650kb)