Intermediate-generalized Chaplygin gas inflationary universe model

Abstract

An intermediate inflationary universe model in the context of a generalized Chaplygin gas is considered. For the matter we consider two different energy densities; a standard scalar field and a tachyon field, respectively. In general, we discuss the conditions of an inflationary epoch for these models. We also, use recent astronomical observations from Wilkinson Microwave Anisotropy Probe seven year data for constraining the parameters appearing in our models.

Warm intermediate inflationary Universe model in the presence of a generalized Chaplygin gas

“…On the other hand, the GCG model can also be considered to achieve an inflationary scenario from the modified Friedmann equation, given by [32] …”

“…(4), is the so-called Chaplygin inflation [32]. In this form, the GCG inflationary model may be viewed as a modification of the gravity according to Eq.…”

“…Likewise, for this case we have found numerically the evolution of the relation T /H = T /H (n s ) (right panel), considering Eqs. (12), (32), and (38) during the strong dissipative regime. As before, in these plots we have used the values C γ = 70, ρ Ch0 = 1, A = 0.775, β = 0.00126 [33], and m p = 1.…”

“…(2) can be extrapolate in the Friedmann equation to study an inflationary scenario [37]. In this extrapolation, we identify the energy density of matter with the contribution of the energy density associated to the standard or tachyonic scalar field [32,[38][39][40]. Specifically this modification is realized from an extrapolation of Eq.…”

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

“…These models also used to investigate the problems of early universe such as inflationary era [45,46,47]. The accreting phenomenon onto various black holes has also been discussed with these models.…”