In the standard cosmological framework, the Hubble diagram is interpreted by assuming that
the light emitted by standard candles propagates in a spatially homogeneous and isotropic …

We have made the largest volume measurement to date of the transition to large-scale
homogeneity in the distribution of galaxies. We use the WiggleZ survey, a spectroscopic …

The effective evolution of an inhomogeneous universe model in any theory of gravitation
may be described in terms of spatially averaged variables. In Einstein's theory, restricting …

I discuss the spherically symmetric but inhomogeneous Lemaitre–Tolman–Bondi (LTB)
metric, which provides an exact toy model for an inhomogeneous universe. Since we …

Constantly accumulating observational data continue to confirm that about 70% of the
energy density today consists of dark energy responsible for the accelerated expansion of …

Photon geodesics are calculated in a Swiss-cheese model, where the cheese is made of the
usual Friedmann-Robertson-Walker (FRW) solution and the holes are constructed from a …

The possibility of obtaining symbolic expressions for cosmic backreaction is explored
through a case study of so-called 2-region models. By using the publicly available symbolic …

Cosmological models typically neglect the complicated nature of the spacetime mani-fold at
small scales in order to hypothesize idealized general relativistic solutions for describing the …

The Hubble diagram is one of the cornerstones of observational cosmology. It is usually
analysed assuming that, on average, the underlying relation between magnitude and …

Light from 'point sources' such as supernovae is observed with a beam width of the order of
the sources' size–typically less than 1 au. Such a beam probes matter and curvature …