Anisotropic behavior of dark energy models in fractal cosmology

被引:14
|
作者
Hossienkhani, H. [1 ]
Yousefi, H. [2 ]
Azimi, N. [3 ]
机构
[1] Islamic Azad Univ, Dept Phys, Hamedan Brunch, Hamadan, Iran
[2] Hamedan Univ Technol, Dept Sci, Hamadan 65155, Iran
[3] Islamic Azad Univ, Hamedan Branch, Dept Math, Hamadan, Iran
关键词
Anisotropic universe; fractal cosmology; ghost DE; generalized ghost DE; Statefinder diagram; spherical collapse; linear perturbation; BARYON ACOUSTIC-OSCILLATIONS; PROBE WMAP OBSERVATIONS; CURRENT-ALGEBRA; CONSTRAINTS; INSTABILITY; STATEFINDER; CONSTANT; UNIVERSE; U(1); SUPERNOVAE;
D O I
10.1142/S0219887818502006
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study effects of anisotropy (although low) on the ghost and generalized ghost dark energy (DE) models in the framework of fractal cosmology. We obtain the equation of state parameter, omega(DE), the deceleration parameter, and the evolution equation of the ghost and generalized ghost dark energy. We find that, in both models, omega(DE) cannot cross the phantom line and eventually the universe approaches a de-Sitter phase of expansion. We show that the anisotropy effects on ghost and generalized ghost dark energy (GDE) in fractal cosmology correspond to Lambda CDM limit on the statefinder plane. We evaluate the anisotropy effects on both the linear perturbation and the spherical collapse from the DE models and compare them with the results of the DE of the Friedmann- Robertson-Walker and Lambda CDM models. We also show that in ghost and generalized ghost cosmologies, the growth factor g(a) rise front the values for an Lambda CDM universe. Finally, we constrain the model parameters by using the maximum likelihood analysis and a combined dataset of baryon acoustic oscillation (BAO) and OHD.
引用
收藏
页数:23
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