Inflaton Potential Reconstruction and Generalized Equations of State

Details Inflaton Potential Reconstruction and Generalized Equations of State Inflaton Potential Reconstruction and Generalized Equations of State

1995-07-31

arxiv.org/abs/astro-ph/9507117v1

Mod.Phys.Lett. A10 (1995) 1977-1988

Astronomy and Astrophysics

Astrophysics

15 pages, plain Latex, to appear in Mod. Phys. Lett. A

Scientific paper

10.1142/S021773239500212X

We extend a previous analysis concerning cosmological fluids with generalized equations of state in order to study inflationary scenarios. In the framework of the slow-roll approximation we find the expressions for the perturbation parameters $\epsilon$, $\eta$ and the density perturbation spectra in terms of the adiabatic index $\ga$ as a function of the universe scale factor. This connection allows to find straightforwardly $\ga$ corresponding, for example, to the simplest {\it chaotic} model and to the Harrison-Zeldovich potential and shows its capability to be applied to more complicate situations. Finally, we use this description to develop a new approach to the early universe dynamics, based on a $1/N$ expansion, where $N$ is the e-fold number. To this aim, we introduce a set of suitable dimensionless variables and show that at the zero-th order in $1/N$, an improved slow-roll approximation is obtained.

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