Journal
ASTROPHYSICAL JOURNAL
Volume 585, Issue 1, Pages 52-56Publisher
IOP PUBLISHING LTD
DOI: 10.1086/346002
Keywords
cosmological parameters; cosmology : theory; distance scale; supernovae : general
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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.
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