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 …

The universe is smooth on large scales but very inhomogeneous on small scales. Why is the
spacetime on large scales modeled to a good approximation by the Friedmann equations …

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 …

It has been proposed that the observed dark energy can be explained by the effect of large-
scale nonlinear inhomogeneities. In this paper, we discuss how observations constrain …

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 …

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 …

We use different particular classes of axially symmetric Szekeres Swiss-cheese models for
the study of the apparent dimming of the supernovae of type Ia. We compare the results with …

We consider a model of the Universe in which the matter content is in the form of discrete
islands, rather than a continuous fluid. In the appropriate limits the resulting large-scale …

Context. Lemaître-Tolman (LT) toy models with a central observer have been used to study
the effect of large scale inhomogeneities on the SN Ia dimming. Claims that a giant void is …

The increasing tension between the different local direct measurements of the Hubble
expansion rate and that inferred from the cosmic microwave background observation by the …