Continuous matter creation and the acceleration of the universe: a replay

TL;DR

This paper defends a previous model of an accelerating universe with matter creation, showing its linear analysis remains valid and consistent with the standard $ ext{Lambda}$CDM cosmology despite criticism.

Contribution

The authors demonstrate that their linear equations accurately describe an accelerating universe with constant creation pressure, reaffirming their earlier conclusions.

Findings

Linear equations valid for accelerating universe with matter creation

Model equivalent to $ ext{Lambda}$CDM cosmology

Previous conclusions remain unchanged

Abstract

In a recent note (arXiv:1012.5069), the investigation performed by the present authors on the evolution of density fluctuations in an accelerated universe including matter creation was criticized. The criticism is based on the fact that the Newtonian background is not "accelerating", invalidating the conclusions of the linear analysis. We show that our linear equations describe adequately an accelerating universe in which the pressure associated to the creation process is constant, a model equivalent to the $\Lambda$CDM cosmology. Thus, our previous conclusions remain unchanged.