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We test the cosmological principle by fitting a dipolar modulation ofdistance modulus and searching for an evolution of this modulation with respectto cosmological redshift. Based on a redshift tomographic method, we divide theJoint Light-curve Analysis compilation of supernovae of type Ia into differentredshift bins, and employ a Markov-Chain Monte-Carlo method to infer theanisotropic amplitude and direction in each redshift bin. However, we do notfind any significant deviations from the cosmological principle, and theanisotropic amplitude is stringently constrained to be less than a fewthousandths at $95\%$ confidence level.

A tomographic test of cosmological principle using the JLA compilation of type Ia supernovae