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: the Union2.1 plus the most distant spectroscopically confirmed SNe Ia (SNe Ia SCP-0401 z=1.713) and two Sloan Digital Sky Survey (SDSS) subsamples. The influence of different SNe Ia light-curve fitters (SALT2 and MLCS2K2) on the results is also verified. We find that a completely transparent universe is in agreement with the largest sample in our analysis (Union 2.1 plus SNe Ia SCP-0401). For SDSS sample a such universe it is compatible at <1.5σ level regardless the SNe Ia light-curve fitting used.
@article{arxiv.1207.1694,
title = {Model-independent constraints on the cosmic opacity},
author = {R. F. L. Holanda and J. C. Carvalho and J. S. Alcaniz},
journal= {arXiv preprint arXiv:1207.1694},
year = {2015}
}