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H. Skarke:
"A non-perturbative approach to inhomogeneous cosmology";
Talk: Inhomogeneous Cosmologies, Torun, Polen; 2017-07-02 - 2017-07-07.

The mass-weighted average has the property that averaging and taking time derivatives
commute. This fact gives it a technical advantage over the more commonly used volume
average and affords numerical computations of a non-perturbative nature. Applying the
resulting framework to a universe with the standard initial conditions (almost perfect homogeneity with only small Gaussian fluctuations) we find that volume evolution in such a universe is not modified significantly by the inhomogeneities, but that light propagation
gets modified in such a way that the observed redshift-distance relations may be explained
without invoking a cosmological constant.

Mass-weighted average, cosmological constant, light propagation, redshift-distance relation