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Revisiting Cardassian model and cosmic constraint

  • Regular Article - Theoretical Physics
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Abstract

In this paper, we revisit the Cardassian model in which the radiation energy component is included. It is important for the early epoch when the radiation cannot be neglected because the equation of state (EoS) of the effective dark energy becomes time variable. Therefore, it is not equivalent to the quintessence model with a constant EoS anymore. This situation was almost overlooked in the literature. By using the recent released Union2 557 of type Ia supernovae (SN Ia), the baryon acoustic oscillation (BAO) from Sloan Digital Sky Survey and the WiggleZ data points, the full information of cosmic microwave background (CMB) measurement given by the seven-year Wilkinson Microwave Anisotropy Probe observation, we constrain the Cardassian model via the Markov Chain Monte Carlo (MCMC) method. A tight constraint is obtained: \(n= -0.0479_{- 0.0732- 0.148}^{+ 0.0730+0.142}\) in 1,2σ regions. The deviation of the Cardassian model from quintessence model is shown in CMB anisotropic power spectra at high l’s parts due to the evolution of EoS. But it is about the order of 0.1/% which cannot be discriminated by current data sets. The Cardassian model is consistent with current cosmic observational data sets.

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Notes

  1. In the sense of small deviation from ΛCDM model.

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Acknowledgements

We thank an anonymous referee for helpful improvement of this paper. This work is supported by the Fundamental Research Funds for the Central Universities (DUT10LK31) and (DUT11LK39) and in part by NSFC under Grants No. 11275035.

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Authors and Affiliations

  1. Institute of Theoretical Physics, School of Physics & Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, P.R. China

    Lixin Xu

  2. College of Advanced Science & Technology, Dalian University of Technology, Dalian, 116024, P.R. China

    Lixin Xu

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Xu, L. Revisiting Cardassian model and cosmic constraint. Eur. Phys. J. C 72, 2134 (2012). https://doi.org/10.1140/epjc/s10052-012-2134-7

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  • DOI: https://doi.org/10.1140/epjc/s10052-012-2134-7

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