English

Dynamics of nonminimally coupled scalar field models with generic potentials in FLRW background

General Relativity and Quantum Cosmology 2021-04-27 v1

Abstract

We study the phase space analysis of a nonminimally coupled scalar field model with different potentials such as KKLT, Higgs, inverse and inverse square. Our investigation brings new asymptotic regimes, and obtains stable de-Sitter solution. In case of KKLT, we do not find stable de-Sitter solution whereas Higgs model satisfies the de-Sitter condition but does not provide a stable de-Sitter solution in usual sense as one of the eigenvalue is zero. We obtain time derivative of Hubble constant H˙=0\dot{H}=0, equation of state wϕ1w_{\phi}\simeq -1, scalar field ϕ=\phi=constant and the positive effective gravitational constant (Geff>0G_{eff}>0), which are missed in our earlier work. Therefore, in case of F(ϕ)RF(\phi)R coupling with F(ϕ)=1ξϕ2F(\phi)= 1-\xi\phi^2 and the models of inverse and inverse square potentials- a true stable de-Sitter solution is trivially satisfied.

Keywords

Cite

@article{arxiv.2011.06930,
  title  = {Dynamics of nonminimally coupled scalar field models with generic potentials in FLRW background},
  author = {M. Shahalam and Shynaray Myrzakul},
  journal= {arXiv preprint arXiv:2011.06930},
  year   = {2021}
}

Comments

13 pages, 5 figures. arXiv admin note: text overlap with arXiv:1905.06856