Non-singular radiation cosmological models

TL;DR

This paper explores the construction of inhomogeneous, singularity-free cosmological models with pure radiation, demonstrating that regularity conditions are easily satisfied, leading to numerous such models.

Contribution

It introduces a method for constructing non-singular inhomogeneous radiation cosmological models and shows that regularity conditions are straightforward to implement.

Findings

Many singularity-free inhomogeneous radiation models exist.

Regularity conditions are easy to satisfy in these models.

The models expand the class of non-singular cosmological solutions.

Abstract

In this paper we analyse the possibility of constructing singularity-free inhomogeneous cosmological models with a pure radiation field as matter content. It is shown that the conditions for regularity are very easy to implement and therefore there is a huge number of such spacetimes.