Abstract
We consider a cosmological model based on a generalization of the equation of state proposed by Nojiri and Odintsov (2004) and Štefančić (2005, 2006). We argue that this model works as a dark fluid model which can interpolate between dust equation of state and the dark energy equation of state. We show how the asymptotic behavior of the equation of state constrained the parameters of the model. The causality condition for the model is also studied to constrain the parameters and the fixed points are tested to determine different solution classes. Observations of Hubble diagram of SNe Ia supernovae are used to further constrain the model. We present an exact solution of the model and calculate the luminosity distance and the energy density evolution. We also calculate the deceleration parameter to test the state of the universe expansion.
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Acknowledgements
The author would like to thank Dr. Adel Awad for valuable discussions and guidance.
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Elkhateeb, E. A viable dark fluid model. Astrophys Space Sci 363, 7 (2018). https://doi.org/10.1007/s10509-017-3221-x
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DOI: https://doi.org/10.1007/s10509-017-3221-x