Generation of CMB and Cosmological constant via bulk viscosity

TL;DR

This paper presents a cosmological model where bulk viscosity causes inflationary density decay, leading to the generation of CMB and a late-time approach to a small constant density.

Contribution

It introduces a simple homogeneous universe model with bulk viscosity that explains CMB generation and late-time density behavior, offering a novel mechanism within cosmology.

Findings

Bulk viscosity causes inflationary density decay.

Model generates Cosmic Microwave Background radiation.

Density approaches a small finite constant at late times.

Abstract

A simple model of uniformly expanding, homogeneous Universe with a bulk viscosity is studied wherein the inflationary density decays due to viscous dissipation during the expansion phase of the Universe. The model is shown to generate the Cosmic Microwave Background radiation (CMB). We also demonstrate that, at late times, the inflationary density asymptotically approaches a small finite constant value.