Newtonian perturbations on models with matter creation


Autoria(s): JESUS, J. F.; OLIVEIRA, F. A.; BASILAKOS, S.; LIMA, J. A. S.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/04/2012

18/04/2012

2011

Resumo

Creation of cold dark matter (CCDM) can macroscopically be described by a negative pressure, and, therefore, the mechanism is capable to accelerate the Universe, without the need of an additional dark energy component. In this framework, we discuss the evolution of perturbations by considering a Neo-Newtonian approach where, unlike in the standard Newtonian cosmology, the fluid pressure is taken into account even in the homogeneous and isotropic background equations (Lima, Zanchin, and Brandenberger, MNRAS 291, L1, 1997). The evolution of the density contrast is calculated in the linear approximation and compared to the one predicted by the Lambda CDM model. The difference between the CCDM and Lambda CDM predictions at the perturbative level is quantified by using three different statistical methods, namely: a simple chi(2)-analysis in the relevant space parameter, a Bayesian statistical inference, and, finally, a Kolmogorov-Smirnov test. We find that under certain circumstances, the CCDM scenario analyzed here predicts an overall dynamics (including Hubble flow and matter fluctuation field) which fully recovers that of the traditional cosmic concordance model. Our basic conclusion is that such a reduction of the dark sector provides a viable alternative description to the accelerating Lambda CDM cosmology.

Identificador

PHYSICAL REVIEW D, v.84, n.6, 2011

1550-7998

http://producao.usp.br/handle/BDPI/15586

10.1103/PhysRevD.84.063511

http://dx.doi.org/10.1103/PhysRevD.84.063511

Idioma(s)

eng

Publicador

AMER PHYSICAL SOC

Relação

Physical Review D

Direitos

restrictedAccess

Copyright AMER PHYSICAL SOC

Palavras-Chave #COSMOLOGICAL CONSTANT #DARK ENERGY #ACCELERATING UNIVERSE #LIGHT CURVES #2DF-SDSS LRG #QSO SURVEY #THERMODYNAMICS #COINCIDENCE #DISTORTIONS #SUPERNOVAE #Astronomy & Astrophysics #Physics, Particles & Fields
Tipo

article

original article

publishedVersion