Stable Inflationary Dissipative Cosmologies

TL;DR

This paper investigates the stability of the de Sitter phase in curved, homogeneous, isotropic universes with a time-varying imperfect fluid, extending previous flat-space analyses and Barrow's work.

Contribution

It extends stability analysis of de Sitter cosmologies to include spatial curvature and time-dependent imperfect fluid parameters.

Findings

Stability conditions for curved de Sitter universes derived

Time variation of fluid parameters affects cosmic stability

Generalization of previous flat-space results

Abstract

The stability of the de Sitter era of cosmic expansion in spatially curved homogeneous isotropic universes is studied. The source of the gravitational field is an imperfect fluid such that the parameters that characterize it may change with time. In this way we extend our previous analysis for spatially-flat spaces as well as the work of Barrow.