R. F. L. Holanda, J. C. Carvalho, J. S. Alcaniz
We use current measurements of the expansion rate $H(z)$ and cosmic background radiation bounds on the spatial curvature of the Universe to impose cosmological model-independent constraints on cosmic opacity. To perform our analyses, we compare opacity-free distance modulus from $H(z)$ data with those from two supernovae Ia compilations, namely, the Union2 and Sloan Digital Sky Survey samples. The influence of different SNe Ia light-curve fitters (SALT2 and MLCS2K2) on the results is also discussed. We find that these fitters present a significant conflict, with the MLCS2K2 method being incompatible with a flat and transparent universe.
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http://arxiv.org/abs/1207.1694
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