Abstract
We investigate the effect of small-scale inhomogeneities on standard candle observations, such as type-Ia supernovae (SNe) observations. The existence of the small-scale inhomogeneities may cause a tension between SNe observations and other observations with larger-diameter sources, such as the cosmic microwave background (CMB) observation. To clarify the impact of the small-scale inhomogeneities, we use the Dyer-Roeder approach. We determined the smoothness parameter as a function of the redshift z so as to compensate the deviation of cosmological parameters for SNe from those for CMB. The range of the deviation which can be compensated by the smoothness parameter satisfying is reported. Our result suggests that the tension may give us the information of the small-scale inhomogeneities through the smoothness parameter.
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