English

Late time evolution of a nonminimally coupled scalar field system

General Relativity and Quantum Cosmology 2019-10-02 v2

Abstract

We revisit the dynamics of a nonminimally coupled scalar field model in case of F(ϕ)RF(\phi)R coupling with F(ϕ)=1ξϕ2F(\phi)= 1-\xi\phi^2 , and the potentials V(ϕ)=V0(1+ϕp)2V(\phi) = V_0 (1+ \phi^p)^2, V(ϕ)=V0eλϕ2V(\phi)= V_0 e^{\lambda \phi^2}. We use an autonomous system to bring out new asymptotic regimes, and find stable de-Sitter solution. Under the chosen functional form of F(ϕ)F(\phi) and steep exponential potentials, a true de-Sitter solution is trivially satisfied for which the equation of state wϕ1w_{\phi}\simeq -1, the effective gravitational constant GeffG_{eff} and field ϕ\phi are constant that has been missed in the power law case and our previous study.

Keywords

Cite

@article{arxiv.1905.06856,
  title  = {Late time evolution of a nonminimally coupled scalar field system},
  author = {M. Shahalam and R. Myrzakulov and Maxim Yu. Khlopov},
  journal= {arXiv preprint arXiv:1905.06856},
  year   = {2019}
}

Comments

9 pages, 3 caption figures