• Recent observational constraints on EoS parameters of a class of emergent Universe

• # Fulltext

https://www.ias.ac.in/article/fulltext/pram/089/02/0027

• # Keywords

Cosmology; dark energy; dark matter; large-scale structures

• # Abstract

Emergent Universe (EU) model is investigated here using the recent observational data of thebackground tests. The background test data comprise observed Hubble data, baryon acoustic oscillation data, cosmic microwave background shift data and Union compilation(2.1) data. The flat EU model obtained by Mukherjee $\it{et al}$ is permitted with a non-linear equation of state (in short, EoS) $(p = Aρ − Bρ^{1/2})$, where $A$ and $B$ are constants. The best-fit values and permitted range of values of the EoS parameters are determined in general EU model and in specific EU model $(A = 0)$ by using chi-square minimization technique. The best-fit values of the EoS parameters are used to study the evolution of the squared adiabatic sound speed $c^{2}_{s}$ , state parameter $\omega$ anddeceleration parameter $q$ for different red-shifts $z$. The present age of the Universe $t_0$ has been determined in general EU model as well as for EU model with $A = 0$. The late accelerating phase of the Universe in the EU model is accommodated satisfactorily.

• # Author Affiliations

1. Physics Department, Alipurduar College, Alipurduar 736 122, India

• # Pramana – Journal of Physics

Volume 96, 2022
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019