期刊
ASTROPHYSICAL JOURNAL
卷 585, 期 1, 页码 52-56出版社
IOP PUBLISHING LTD
DOI: 10.1086/346002
关键词
cosmological parameters; cosmology : theory; distance scale; supernovae : general
The distant Type Ia supernovae data compiled by Perlmutter et al. are used to analyze the Cardassian expansion scenario, which was recently proposed by Freese & Lewis as an alternative to a cosmological constant ( or more generally a dark energy component) in explaining the currently accelerating universe. We show that the allowed intervals for n and z(eq), the two parameters of the Cardassian model, will give rise to a universe with a very low matter density, which can hardly be reconciled with the current value derived from the measurements of the cosmic microwave background anisotropy and galaxy clusters (cluster baryon fraction). As a result, this Cardassian expansion proposal does not seem to survive the magnitude-redshift test for the present Type Ia supernovae data, unless the universe contains primarily baryonic matter.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据