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Revisiting generalized Chaplygin gas as a unified dark matter and dark energy model

  • Regular Article - Theoretical Physics
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Abstract

In this paper, we revisit the generalized Chaplygin gas (GCG) model as a unified dark matter and dark energy model. The energy density of GCG model is given as ρ GCG/ρ GCG0=[B s +(1−B s )a −3(1+α)]1/(1+α), where α and B s are two model parameters which will be constrained by type Ia supernova as standard candles, baryon acoustic oscillation as standard rulers and the seventh year full WMAP data points. In this paper, we will not separate GCG into dark matter and dark energy parts any more as adopted in the literature. By using the Markov Chain Monte Carlo method, we find the results \(\alpha=0.00126_{-0.00126- 0.00126}^{+ 0.000970+ 0.00268}\) and \(B_{s}= 0.775_{-0.0161- 0.0338}^{+ 0.0161+ 0.0307}\).

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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

  4. Department of Physics, Liaoning Normal University, Dalian, 116029, People’s Republic of China

    Jianbo Lu

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

    Yuting Wang

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  1. Lixin Xu
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  2. Jianbo Lu
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  3. Yuting Wang
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Correspondence to Lixin Xu.

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Xu, L., Lu, J. & Wang, Y. Revisiting generalized Chaplygin gas as a unified dark matter and dark energy model. Eur. Phys. J. C 72, 1883 (2012). https://doi.org/10.1140/epjc/s10052-012-1883-7

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  • DOI: https://doi.org/10.1140/epjc/s10052-012-1883-7

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