Cosmology, Thermodynamics and Matter Creation

TL;DR

This paper reviews various methods for matter creation in cosmology, introduces a covariant fluid model with matter creation, and discusses how recent results fit within the standard big bang framework.

Contribution

It presents a covariant formulation of imperfect fluids with matter creation and clarifies the applicability of recent matter creation results in cosmological models.

Findings

Recovery of Prigogine et al.'s results within the big bang model

Explicit limits of validity for matter creation approaches

A covariant fluid framework for matter creation in cosmology

Abstract

Several approaches to the matter creation problem in the context of cosmological models are summarily reviewed. A covariant formulation of the general relativistic imperfect simple fluid endowed with a process of matter creation is presented. By considering the standard big bang model, it is shown how the recent results of Prigogine et alii \cite{1} can be recovered and, at the same time their limits of validity are explicited.