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论文类型：期刊论文

发表时间：2009-03-21

发表刊物：MODERN PHYSICS LETTERS A

收录刊物：SCIE

卷号：24

期号：9

页面范围：683-691

ISSN号：0217-7323

关键字：Variable modified Chaplygin gas (VMCG); darkenergy; dark matter; growth index

摘要：We consider a variable modified Chaplygin gas (VMCG) model with unified dark energy and dark matter. Some cosmological quantities are studied, such as the state parameter of dark energy w(de), the fractional energy densities Omega(i) (i respectively denotes baryons, dark matter, dark energy), the deceleration parameter q and the growth index f. By analysis, we find that the state parameter of dark energy cancross the phantom divide w(Lambda) = -1, the behavior of VMCG is similar to radiation in the early time and will be quinessence model in the future. Therefore the universe will not end up with Big Rip.