Hyperbolic Cardassian universe

  • We propose a hyperbolic function form of the Cardassian component in the Cardassian model. Using the repartition of this Cardassian component, we can obtain a non-zero gravitational interaction between the time derivative of Ricci scalar curvature and the baryon/lepton number current in the radiation-dominated universe. Furthermore, the other term that acts like a non-zero cosmological constant would give an accelerated expansion of current universe and the features of this model do not violate our desired requirements.
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ZHANG Xu-Ning. Hyperbolic Cardassian universe[J]. Chinese Physics C, 2014, 38(7): 075102. doi: 10.1088/1674-1137/38/7/075102
ZHANG Xu-Ning. Hyperbolic Cardassian universe[J]. Chinese Physics C, 2014, 38(7): 075102.  doi: 10.1088/1674-1137/38/7/075102 shu
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Received: 2013-09-02
Revised: 2013-12-12
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Hyperbolic Cardassian universe

    Corresponding author: ZHANG Xu-Ning,
  • Hezhou University, Hezhou 542800, China

Abstract: We propose a hyperbolic function form of the Cardassian component in the Cardassian model. Using the repartition of this Cardassian component, we can obtain a non-zero gravitational interaction between the time derivative of Ricci scalar curvature and the baryon/lepton number current in the radiation-dominated universe. Furthermore, the other term that acts like a non-zero cosmological constant would give an accelerated expansion of current universe and the features of this model do not violate our desired requirements.

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