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Snia Data to Probe the Cosmological Principle

Recently collected SNIa data have been used to address the problem of measuring the cos-mological parameters of the universe. Analysed in the framework of homogeneous models, they have yielded, as a primary result, a strictly positive cosmological constant. However, a straight reading of the published measurements, conducted with no a priori idea of which model would best describe our universe, at least up to redshifts z=1, does not exclude the possibility of ruling out the Cosmological Principle-and cosmological constant-hypotheses. It is here shown how the large scale (in)homogeneity of this part of the universe can be tested on our past light cone, using the magnitude-redshift relation, provided sufficiently accurate data from sources at redshifts approaching z=1 would be available.