| A Check on the Cardassian Expansion Model with Type-la Supernovae Data |
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| 作者姓名： | Li Cao
National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Li Cao
National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012; |
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| 基金项目： | National Natural Science Foundation of China. |
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| 摘 要： | 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.
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A Check on the Cardassian Expansion Model with Type-la Supernovae Data |
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| Li Cao
National Astronomical Observatories,Chinese Academy of Sciences,Beijing ,.A Check on the Cardassian Expansion Model with Type-la Supernovae Data[J].Chinese Journal of Astronomy and Astrophysics,2003(4). |
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| Authors: | Li Cao
National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| Institution: | Li Cao
National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012, |
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| Abstract: | 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. |
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| Keywords: | supernovae: general-cosmology: theory-distances and redshifts |
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