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Paper   IPM / P / 14628
School of Physics
  Title:   Generalized Ghost Dark Energy with Non-Linear Interaction
  Author(s): 
1.  E. Ebrahimi
2.  H. Golchin
3.  A. Mehrabi
4.  S.M.S. Movahed
  Status:   Published
  Journal: Int. J. Mod. Phys. D
  Year:  2017
  Pages:   Online
  Supported by:  IPM
  Abstract:
In this paper we investigate ghost dark energy model in the presence of non-linear interaction between dark energy and dark matter. The functional form of dark energy density in the generalized ghost dark energy (GGDE) model is ρDf(H, H2) with coefficient of H2 represented by ζ and the model contains three free parameters as ΩD, ζ and b2 (the coupling coefficient of interactions). We propose three kinds of non-linear interaction terms and discuss the behavior of equation of state, deceleration and dark energy density parameters of the model. We also find the squared sound speed and search for signs of stability of the model. To compare the interacting GGDE model with observational data sets, we use more recent observational outcomes, namely SNIa, gamma-ray bursts, baryonic acoustic oscillation and the most relevant CMB parameters including, the position of acoustic peaks, shift parameters and redshift to recombination. For GGDE with the first non-linear interaction, the joint analysis indicates that ΩD=0.7009+0.0077−0.0077, b2=0.171+0.042−0.042 and ζ = 0.116+0.044−0.098 at 1 optimal variance error. For the second interaction, the best fit values at 1σ confidence are ΩD=0.6961+0.0084−0.0084, b2=0.054+0.011−0.014 and ζ ≤ 0.0445. According to combination of all observational data sets considered in this paper the best fit values for third non-linearly interacting model are ΩD=0.6947+0.0086−0.0086, b2=0.0143+0.0032−0.0054 and ζ ≤ 0.0326 at 1σ confidence interval. Finally we found that the presence of interaction is confirmed in mentioned models via current observational data sets.

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