On cosmological observables in a swiss-cheese universe (Conference proceeding)

TL;DR

This paper explores how inhomogeneities in a Swiss-cheese universe model influence cosmological observables and the potential role of back-reaction in explaining dark energy, using two distinct analytical approaches.

Contribution

It introduces a physically meaningful framework for analyzing back-reaction effects in inhomogeneous cosmologies through two complementary methods.

Findings

Inhomogeneities significantly affect cosmological observables.

Back-reaction could mimic dark energy effects.

Two approaches provide consistent insights into inhomogeneous universe modeling.

Abstract

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.