A Check on the Cardassian Expansion Model with Type-Ia Supernovae Data

Details A Check on the Cardassian Expansion Model with Type-Ia Supernovae Data A Check on the Cardassian Expansion Model with Type-Ia Supernovae Data

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003chjaa...3..341c&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 3, p. 341-346

Astronomy and Astrophysics

Astrophysics

5

Supernovae: General, Cosmology: Theory, Distances And Redshifts

Scientific paper

We use the magnitude-redshift relation for the type Ia 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 = 65.3 ksm, n=0.35 and Ωm=0.05. When the highest redshift supernova, SN 1997ck, is excluded, H0 remains the same, but n becomes 0.20 and Ωm, 0.15, and the matter density remains unreasonably low. Our result shows that this particular scenario is strongly disfavoured by the SNeIa data.

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