Spherical collapse for a viscous generalized Chaplygin GaS model

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776115020156· OSTI ID:22472315

Li, Wei; Xu, Lixin ^[1]

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1. Dalian University of Technology, Institute of Theoretical Physics, School of Physics and Optoelectronic Technology (China)

The nonlinear collapse for a viscous generalized Chaplygin gas model (VGCG) is analyzed in the framework of spherical top-hat collapse. Because the VGCG and baryons are essential to form the large-scale structure, we focus on their nonlinear collapse in this paper. We discuss the influence of model parameters α and ζ{sub 0} on the spherical collapse by varying their values and compare with the ΛCDM model. The results show that for the VGCG model, smaller ζ{sub 0} and larger α make the structure formation earlier and faster, and the collapse curves of the VGCG model are almost coincident with those of the ΛCDM model when the model parameter α is less than 10{sup −2}.

• OSTI ID: 22472315
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 120, Issue 4; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BARYONS
COMPARATIVE EVALUATIONS
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
NONLINEAR PROBLEMS
NONLUMINOUS MATTER
SPHERICAL CONFIGURATION