Squeezed Thermal State Representation of the Inflaton and Particle Production in Bianchi type-I Universe

TL;DR

This paper models the inflaton as a squeezed thermal state in a Bianchi type-I universe, analyzing particle production and anisotropic expansion using semiclassical gravity, revealing power-law growth of scale factors.

Contribution

It introduces a novel squeezed thermal state formalism to study scalar fields and particle production in anisotropic cosmological models.

Findings

Scale factors follow t^(2/3) power-law expansion.

Nonclassical thermal particle production occurs in Bianchi type-I universe.

The formalism provides insights into anisotropic inflationary dynamics.

Abstract

In this study, we use a single-mode squeezed thermal vacuum state formalism and examine the nature of a massive homogeneous scalar field, minimally coupled to the gravity in the framework of semiclassical gravity in the Bianchi type-I universe. We have obtained an estimate leading solution to the semiclassical Einstein equation for the Bianchi type-I universe shows, each scale factor in its respective direction obeys t^(2/3) power-law expansion. The mechanism of the nonclassical thermal cosmological particle production is also analyzed in the Bianchi type-I universe.