Large-scale inhomogeneities may improve the cosmic concordance of supernovae

Understand

We reanalyze the supernovae data from the Union Compilation including the weak lensing effects caused by inhomogeneities.

• We compute the lensing probability distribution function for each background solution described by the parameters Omega_M, Omega_L and w in the presence of inhomogeneities, approximately modeled with a single-mass population of halos.
• We then perform a likelihood analysis in the space of FLRW-parameters and compare our results with the standard approach.
• We find that the inclusion of lensing can move the best-fit model significantly towards the cosmic concordance of the flat LCDM model, improving the agreement with the constraints coming from the cosmic microwave background and baryon acoustic oscillations.