Emergence of cosmological scaling behavior in asymptotic regime

Abstract

In this paper we consider a scalar field system with a class of potentials given by the expression, $V(\varphi )\propto {\varphi }^m\exp (-\lambda {\varphi }^n/M_{Pl}^n)$; $m⩾0,n>1$ for which $\Gamma =V_{\varphi \varphi }V/V_{\varphi }^2\to 1$ as $|\varphi |\to \infty$. We carry out dynamical analysis for the underlying system choosing a suitable set of autonomous variables and find all the fixed points. In particular, we show that the scaling solution is an attractor of the system in the asymptotic regime. We indicate the application of the solution to models of quintessential inflation.

20 pages, 9 figures, minor corrections, version to appear in Phys. Rev. D