We consider the effect on the propagation of light of inhomogeneities with sizes of order 10
Mpc or larger. The Universe is approximated through a variation of the Swiss-cheese model.
The spherical inhomogeneities are void-like, with central underdensities surrounded by
compensating overdense shells. We study the propagation of light in this background,
assuming that the source and the observer occupy random positions, so that each beam
travels through several inhomogeneities at random angles. The distribution of luminosity …