• Phenomenology of a realistic accelerating universe using tracker ﬁelds

• # Fulltext

https://www.ias.ac.in/article/fulltext/pram/059/03/L0553-L0561

• # Keywords

Tracking of scalar ﬁelds; cosmology.

• # Abstract

We present a realistic scenario of tracking of scalar ﬁelds with varying equation of state. The astrophysical constraints on the evolution of scalar ﬁelds in the physical universe are discussed. The nucleosynthesis and the galaxy formation constraints have been used to put limits on $\Omega_{\phi}$ and estimate 𝜖 during cosmic evolution. Interpolation techniques have been applied to estimate $\epsilon\simeq 0.772$ at the present epoch. The epoch of transition from matter to quintessence dominated era and consequent onset of acceleration in cosmic expansion is calculated and taking the lower limit $\Omega^{0}_{n} = 0.2$ as estimated from $SN_{e}I_{a}$ data, it is shown that the supernova observations beyond redshift $z = 1$ would reveal deceleration in cosmic expansion.

• # Author Affiliations

1. Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
2. Department of Mathematics and Astronomy, Lucknow University, Lucknow 226 007, India

• # Pramana – Journal of Physics

Volume 95, 2021
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019