Example of an inhomogeneous cosmological model in the context of backreaction

Abstract

In this article, we present an example of an inhomogeneous cosmological model, which is inspired by the linear perturbation theory. The metric of this model can be described as the Einstein-de Sitter background with a periodically distributed dust overdensities. The model construction enables application of the Green-Wald averaging scheme and the Buchert averaging technique simultaneously. We compare the angular diameter distance function of the considered model to the angular diameter distances corresponding to the average space-times given by the Green-Wald and the Buchert frameworks respectively.

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• Second-order dust perturbations of the non-flat FLRW model with the positive cosmological constant
• The averaging problem on the past null cone in inhomogeneous dust cosmologies
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