How close can an Inhomogeneous Universe mimic the Concordance Model?

TL;DR

This paper examines whether inhomogeneous universe models can replicate the standard cosmological model's observations and emphasizes the importance of testing the Copernican principle to distinguish between these models and LCDM.

Contribution

It analyzes the potential of inhomogeneous models to mimic LCDM and highlights the need for tests of the Copernican principle using large scale structure data.

Findings

Inhomogeneous models can reproduce some late-time universe observations.

Testing the Copernican principle is crucial for distinguishing models.

Large scale structure data can help differentiate between models.

Abstract

Recently, spatially inhomogeneous cosmological models have been proposed as an alternative to the LCDM model, with the aim of reproducing the late time dynamics of the Universe without introducing a cosmological constant or dark energy. This paper investigates the possibility of distinguishing such models from the standard LCDM using background or large scale structure data. It also illustrates and emphasizes the necessity of testing the Copernican principle in order to confront the tests of general relativity with the large scale structure.