Note on "Continuous matter creation and the acceleration of the universe: the growth of density fluctuations"

TL;DR

This paper critiques a recent Newtonian analysis of a relativistic cosmological model with matter creation, showing it does not accurately represent the original model and fails to reproduce the observed acceleration transition.

Contribution

It demonstrates that the previous Newtonian approach does not correctly recover the unperturbed CCDM model and does not exhibit the acceleration transition seen in observations.

Findings

The analyzed model does not match the original CCDM cosmology.

The basic equations lead to a decelerating universe without acceleration transition.

The conclusions of the previous work are based on a model inconsistent with observational data.

Abstract

Recently, de Roany & Pacheco (2010) performed a Newtonian analysis on the evolution of perturbations for a class of relativistic cosmological models with Creation of Cold Dark Matter (CCDM) proposed by the present authors. In this note we demonstrate that the basic equations adopted in their work do not recover the specific (unperturbed) CCDM model. Unlike to what happens in the original CCDM cosmology, their basic conclusions refer to a decelerating cosmological model in which there is no transition from a decelerating to an accelerating regime as required by SNe type Ia and complementary observations.