Constraining cosmic isotropy with type Ia supernovae

We investigate the validity of the Cosmological Principle by constraining the cosmological parameters H0 and q0 through the celestial sphere. Our analyses are performed in a lowredshift regime in order to follow a model independent approach, using both Union2.1 and JLA Type Ia Supernovae (SNe) compilations. We find that the preferred direction of the H0 parameter in the sky is consistent with the bulk flow motion of our local Universe in the Union2.1 case, while the q0 directional analysis seem to be anti-correlated with the H0 for both data sets. Furthermore, we test the consistency of these results with Monte Carlo (MC) realisations, finding that the anisotropy on both parameters are significant within 2 3σ confidence level, albeit we find a significant correlation between the H0 and q0 mapping with the angular distribution of SNe from the JLA compilation. Therefore, we conclude that the detected anisotropies are either of local origin, or induced by the non-uniform celestial coverage of the SNe data set.