Fitting Non-Minimally Coupled Scalar Models to Gold SnIa Dataset

Mingxing Luo; Qiping Su

doi:10.1016/j.physletb.2005.08.050

paper

Fitting Non-Minimally Coupled Scalar Models to Gold SnIa Dataset

arXiv:astro-ph/0506093 · doi:10.1016/j.physletb.2005.08.050

Abstract

Non-minimally coupled theories of special potentials are analyzed numerically. Such theories yield equations of state $ω < - 1$ and oscillations of the cosmological expansion, which are favored by the recent analysis of observations. Fitting these theories to the Gold SnIa dataset, we obtain results comparable with other models. A potential of the form $V (ϕ) = V_{0} e^{a_{1} ϕ^{2}}$ yields $χ_{min}^{2} = 170.127$ . Similar results are obtained for potentials of the form $V (ϕ) = V_{0} + a_{1} ϕ^{n}$ .

8 pages, 7 figures, accepted for publication in Phys. Lett. B