Zusammenfassung
By means of a toy Swiss-cheese cosmological model we will discuss how to set
up and carry out in a physically meaningful way the idea of back-reaction,
according to which dark energy could be an effective source. We will follow two
distinct approaches. One is focused on how cosmological observables are
affected by inhomogeneities, while the other is focused on a theoretical
description of the inhomogeneous universe by means of a mean-field description.
Nutzer