2015/02/28 by Amin Salehi, S. Aftabi
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1007/jhep09(2016)140
published as JHEP 1609(2016)140 · 40 page 25 fig. arXiv admin note: text overlap with arXiv:1303.0961, arXiv:1302.1866, arXiv:1411.1466, arXiv:1107.5807, arXiv:1306.3164 by other authors
arxiv created 2016/07/17 · arxiv updated 2019/07/03
Recent astronomical observations show that the universe may be anisotropic on large scales. The Union2 SnIa data hint that the universe has a preferred direction. If such a cosmological privileged axis indeed exists, one has to consider an anisotropic expanding Universe instead of the isotropic cosmological model. In this paper, we present a detailed analysis of the dark energy dipole in f(R,T)=f1(R)+f2(T) Cosmological Model using three types of dipole fit (DF) method which are (I)dipole + monopole fitting for distance modulus(DMFDM), (II)dipole + monopole fitting for luminosity distance(DMFLD) and (III) general dipole fitting for luminosity distance(GDFLD). We have found the maximum anisotropic deviation direction for (DMFDM) method as (l, b)=(315+25-25,-23+14-15), for (DMFLD) as (l, b)=(l, b)=(315+35-37,-23+18-18), and for (GDFLD) method as (l, b)=(317+32-32,-23+18-18) which are located very close to each other. We compare our model with the CPL, ΛCDM and ωCDM models. Constraints on (l, b) in f(R, T) model are not much different from the cases of the CPL, ΛCDM and ωCDM models. Moreover, the results are consistent with other studies.