Quintessential Inflation with Dissipative fluid

TL;DR

This paper presents a cosmological model with a scalar field and dissipative matter fluid that naturally produces inflation, late-time acceleration, and aligns with key cosmological constraints, including nucleosynthesis and structure formation.

Contribution

It introduces an exact solution for a quintessence inflation model with dissipative fluid, demonstrating a universe that transitions from inflation to acceleration with an attractor behavior.

Findings

Model exhibits early inflation and late-time acceleration.

Satisfies nucleosynthesis and structure formation constraints.

Shows attractor behavior towards de Sitter universe.

Abstract

We have investigated cosmological models with a self-interacting scalar field and a dissipative matter fluid as the sources of matter. Different variables are expressed in terms of a {\it generating function}. Exact solutions are obtained for one particular choice of the {\it generating function} The potential corresponding to this generating function is a standard tree-level potential arising in the perturbative regime in quantum field theory. With suitable choice of parameters, the scale factor in our model exhibits both inflationary behaviour in the early universe as well as an accelerating phase at late times with a decelerating period in between. It also satisfies the constraints for primeval nucleosynthesis and structure formation and seems to solve the cosmic coincidence problem. The solution exhibits a attractor nature towards a asymptotic de-sitter universe.