http://arxiv.org/abs/1402.1760
We review the appropriateness of using SNIa observations to detect potential signatures of anisotropic expansion in the Universe. We focus on the two independent datasets of SNIa provided by SNLS3 and Union2 and mainly use the hemispherical comparison method to detect a possible anisotropic expansion. We perform a complete analysis by making use of MCMC methods and compare with previous studies where non-diagonal components of the covariance matrix were neglected. Finally, we take advantage of the particular distribution of SNIa in the SNLS3 data set in which the observations were taken along 4 different directions. We fit each direction independently and find consistent results at the 1$\sigma$ level. Although the likelihoods peak at relatively different values of $\Omega_m$, the low number of data along each direction gives rise to large errors so that the likelihoods are sufficiently broad as to overlap within 1$\sigma$.
J. Jimenez, V. Salzano and R. Lazkoz
Tue, 11 Feb 14
25/55
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