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Modified Chaplygin gas as a unified dark matter and dark energy model and cosmic constraints

  • Regular Article - Theoretical Physics
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Abstract

A modified Chaplygin gas model (MCG), ρ MCG/ρ MCG0=[B s +(1−B s )a −3(1+B)(1+α)]1/(1+α), as a unified dark matter model and dark energy model, is constrained by using current available cosmic observational data points which include type Ia supernovae, baryon acoustic oscillation and the 7-year full WMAP data points. As a contrast to the consideration in the literature, we do not separate the MCG into two components, i.e. dark mater and dark energy component, but we take it as a whole energy component—a unified dark sector. By using a Markov Chain Monte Carlo method, a tight constraint is obtained: \(\alpha= 0.000727_{- 0.00140- 0.00234}^{+ 0.00142+ 0.00391}\), \(B=0.000777_{- 0.000302- 0.000697}^{+ 0.000201+ 0.000915}\) and \(B_{s}= 0.782_{- 0.0162- 0.0329}^{+ 0.0163+ 0.0307}\).

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Authors and Affiliations

  1. Institute of Theoretical Physics, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Lixin Xu & Yuting Wang

  2. College of Advanced Science & Technology, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Lixin Xu

  3. Korea Astronomy and Space Science Institute, Yuseong Daedeokdaero 776, Daejeon, 305-348, R. Korea

    Lixin Xu & Hyerim Noh

  4. Institute of Cosmology & Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, UK

    Yuting Wang

Authors
  1. Lixin Xu
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  2. Yuting Wang
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  3. Hyerim Noh
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Correspondence to Lixin Xu.

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Xu, L., Wang, Y. & Noh, H. Modified Chaplygin gas as a unified dark matter and dark energy model and cosmic constraints. Eur. Phys. J. C 72, 1931 (2012). https://doi.org/10.1140/epjc/s10052-012-1931-3

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  • DOI: https://doi.org/10.1140/epjc/s10052-012-1931-3

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