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《中国天文和天体物理学报(英文版)》 2003-04
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A Check on the Cardassian Expansion Model with Type-la Supernovae Data

Li Cao National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;  
We use the magnitude-redshift relation for the type la supernova data compiled by Riess et al. to analyze the Cardassian expansion scenario. This scenario assumes the universe to be flat, matter dominated, and accelerating, but contains no vacuum contribution. The best fitting model parameters are H0 = 65.3kms-1 Mpc-1, n=0.35 and (?)m = 0.05. When the highest redshift supernova, SN 1997ck, is excluded, H0 remains the same, but n becomes 0.20 and (?)m, 0.15, and the matter density remains unreasonably low. Our result shows that this particular scenario is strongly disfavoured by the SNela data.
【Fund】: National Natural Science Foundation of China.
【CateGory Index】: P159.3
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