| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil
[2] Observ Nacl, Dept Astron, BR-20921400 Rio De Janeiro - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Astroparticle Physics; v. 31, n. 3, p. 233-236, APR 2009. |
| Web of Science Citations: | 8 |
| Abstract | |
We propose a new class of accelerating world models unifying the cosmological dark sector (dark matter and dark energy). All the models are described by a simplified version of the Chaplygin gas quartessence cosmology. It is found that even for Omega(k) not equal 0, this quartessence scenario depends only on a pair of parameters which can severely be constrained by the cosmological tests. As an example we perform a joint analysis involving the latest SNe type la data and the recent Sloan Digital Sky Survey measurement of baryon acoustic oscillations. In our analysis we have considered the SNe type la Union sample compiled by Kowalski et al. {[}M. Kowalski et al., Astrophys. J. 686 (2008) 749, arXiv:0804.4142]. At 95.4% (c.l.), we find for BAD + Union sample, alpha = 0.81(-0.04)(+0.04) and Omega(Q4) = 1.15(-0.17)(+0.16) The best-fit for this simplified quartessence scenario is a spatially closed Universe and its reduced chi(2) is exactly the same of the flat concordance model (Lambda CDM). (C) 2009 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 04/13668-0 - Cosmology in the era of precision: dark energy, dark matter and background cosmic radiation |
| Grantee: | Jose Ademir Sales de Lima |
| Support Opportunities: | Research Projects - Thematic Grants |