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论文类型：期刊论文

发表时间：2015-04-01

发表刊物：JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS

收录刊物：SCIE、EI、Scopus

卷号：120

期号：4

页面范围：613-617

ISSN号：1063-7761

摘要：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 alpha and zeta(0) on the spherical collapse by varying their values and compare with the I > CDM model. The results show that for the VGCG model, smaller zeta(0) and larger alpha make the structure formation earlier and faster, and the collapse curves of the VGCG model are almost coincident with those of the I > CDM model when the model parameter alpha is less than 10(-2).