English

Variable Equation of State for Generalized Dark Energy Model

General Physics 2011-07-15 v1 General Relativity and Quantum Cosmology

Abstract

We present a model for the present accelerating Universe and focus on the different important physical variables involved in the model under the phenomenological assumption ΛH2\Lambda \propto H^2 with a prescription for equation of state parameter in the form ω(t)=ω0+ω1τt2\omega(t)=\omega_0+\frac{\omega_1\tau}{t^2}, where ω0\omega_0 and ω1\omega_1 are two constants and τ\tau is a parameter having dimension of time t2t^2. General expressions for the density parameter Ω\Omega and deceleration parameter qq are obtained which under specific bound reproduce some of the previous results. We explore physical features of these parameters which (i) provide the scenario of complete evolution of the cosmos with ω(t)\omega(t) and (ii) agree mostly with the observational status of the present phase of the accelerating Universe.

Keywords

Cite

@article{arxiv.1003.5895,
  title  = {Variable Equation of State for Generalized Dark Energy Model},
  author = {Saibal Ray and Farook Rahaman and Utpal Mukhopadhyay and Ruby Sarkar},
  journal= {arXiv preprint arXiv:1003.5895},
  year   = {2011}
}

Comments

6 Latex pages, 3 figures

R2 v1 2026-06-21T15:04:40.873Z