skip to main content

SciTech ConnectSciTech Connect

Title: Spherical collapse for a viscous generalized Chaplygin GaS model

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}.
Authors:
;  [1]
  1. Dalian University of Technology, Institute of Theoretical Physics, School of Physics and Optoelectronic Technology (China)
Publication Date:
OSTI Identifier:
22472315
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 4; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COMPARATIVE EVALUATIONS; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; COSMOLOGY; NONLINEAR PROBLEMS; NONLUMINOUS MATTER; SPHERICAL CONFIGURATION