| Texto completo | |
| Autor(es): |
Lima, J. A. S.
;
Jesus, J. F.
;
Oliveira, F. A.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Cosmology and Astroparticle Physics; v. N/A, n. 11, p. 14-pg., 2010-11-01. |
| Resumo | |
A new accelerating cosmology driven only by baryons plus cold dark matter (CDM) is proposed in the framework of general relativity. In this scenario the present accelerating stage of the Universe is powered by the negative pressure describing the gravitationally-induced particle production of cold dark matter particles. This kind of scenario has only one free parameter and the differential equation governing the evolution of the scale factor is exactly the same of the Lambda CDM model. For a spatially flat Universe, as predicted by inflation (Omega(dm) + Omega(baryon) = 1), it is found that the effectively observed matter density parameter is Omega(meff) = 1 - alpha, where alpha is the constant parameter specifying the CDM particle creation rate. The supernovae test based on the Union data (2008) requires alpha similar to 0.71 so that Omega(meff) similar to 0.29 as independently derived from weak gravitational lensing, the large scale structure and other complementary observations. (AU) | |
| Processo FAPESP: | 10/05416-2 - Energia escura e a aceleração do universo: aspectos conceituais e testes observacionais |
| Beneficiário: | José Fernando de Jesus |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 04/13668-0 - Cosmologia na era da precisão: energia escura, matéria escura e radiação cósmica de fundo |
| Beneficiário: | Jose Ademir Sales de Lima |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |