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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Shear and rotation in Chaplygin cosmology

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Author(s):
Del Popolo, A. [1, 2] ; Pace, F. [3] ; Maydanyuk, S. P. [4] ; Lima, J. A. S. [2] ; Jesus, J. F. [2, 5]
Total Authors: 5
Affiliation:
[1] Univ Catania, Dipartimento Fis & Astron, I-95125 Catania - Italy
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil
[3] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants - England
[4] Natl Acad Sci Ukraine, Inst Nucl Res, UA-03680 Kiev - Ukraine
[5] Univ Estadual Paulista, BR-18409010 Sao Paulo - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Physical Review D; v. 87, n. 4 FEB 21 2013.
Web of Science Citations: 36
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 type: 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 type: Scholarships in Brazil - Post-Doctorate
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 type: Research Projects - Thematic Grants