| Full text | |
| Author(s): |
Del Popolo, A.
;
Pace, F.
;
Maydanyuk, S. P.
;
Lima, J. A. S.
;
Jesus, J. F.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 87, n. 4, p. 10-pg., 2013-02-21. |
| Abstract | |
We study the effect of shear and rotation on results previously obtained dealing with the application of the spherical collapse model (SCM) to generalized Chaplygin gas (gCg)-dominated universes. The system is composed of baryons and gCg and the collapse is studied for different values of the parameter alpha of the gCg. We show that the joint effect of shear and rotation is that of slowing down the collapse with respect to the simple SCM. This result is of utmost importance for the so-called unified dark matter models, since the described slowdown in the growth of density perturbations can solve one of the main problems of the quoted models, namely the instability described in previous papers [e. g., H. B. Sandvik et al., Phys. Rev. D 69, 123524 (2004)] at the linear perturbation level. DOI: 10.1103/PhysRevD.87.043527 (AU) | |
| FAPESP's process: | 11/20688-1 - Constraining accelerating models of the universe with SNe type IA, galaxy clusters, small-scale structure and complementary observations |
| Grantee: | Jose Ademir Sales de Lima |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |
| FAPESP's process: | 10/05416-2 - Dark energy and the accelerating Universe: conceptual aspects and observational tests |
| Grantee: | José Fernando de Jesus |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| 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 |