Constraints on the Cardassian expansion models from the latest observational data

Details Constraints on the Cardassian expansion models from the latest observational data Constraints on the Cardassian expansion models from the latest observational data

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jcap...08..020w&link_type=abstract

Journal of Cosmology and Astroparticle Physics, Issue 08, pp. 020 (2007).

Physics

5

Scientific paper

We study observational constraints on Cardassian expansion models that account for the accelerated expansion of the universe via modification of the Friedmann equation. We find significant constraints on the model parameters using the latest type Ia supernovae, the baryon acoustic peak in the large scale correlation function of the Sloan Digital Sky Survey of luminous red galaxies, the cosmic microwave background radiation shift parameter, the x-ray gas mass fractions in clusters of galaxies and the observational H(z) data. In the original Cardassian model, we find Ωm = 0.27 ± 0.03, n = 0.01 ± 0.09 at the 1σ confidence level. This result is consistent with the flat ΛCDM cosmology. In the modified polytropic Cardassian model, we obtain β = 0.27-0.25+3.65 and n = -1.86-4.20+2.26(1σ). We also find that the acceleration happens for zT = 0.70 ± 0.05(1σ) in the original Cardassian model. In the modified polytropic Cardassian model, the transition redshift is zT = 0.58-0.18+0.17(1σ).

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