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  • 1
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    Hyperbolic Cardassian universe (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-07-24
    Description: 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.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Constraints of gravitational baryo/leptogenesis on Cardassian expansion (2011)
    Institute of Physics (IOP)
    Details
    Publication Date: 2011-10-20
    Description: In this paper, proceeding from the relation between the Cardassian model and the accelerated expansion of the universe, adopting a parametric method which does not depend on a precise mechanism for gravitational baryo/leptogenesis and using the model parameter of CPT -violating interaction, we study the role of the modified Friedmann equation which plays a role in the matter asymmetry of the early epoch and the accelerated expansion of the present universe. Thus the appropriate Cardassian component in the radiation-dominated era or in the matter-dominated universe can be obtained. The results indicate that early CPT -violation is included in the Cardassian term. In the same way, the present Cardassian term that belongs to a quintessence-like model can drive the universe towards a flat, matter-dominated and accelerating expansion.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
    Location Call Number Limitation Availability
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    PAPER CURRENT
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