Cosmological background solutions and cosmological backreactions

TL;DR

This paper develops a framework based on cosmological background solutions to analyze various backreaction proposals that aim to explain cosmic observations without invoking dark energy.

Contribution

It introduces a new framework utilizing cosmological background solutions to systematically study different backreaction models in cosmology.

Findings

Provides a unified approach to compare backreaction proposals.

Facilitates understanding of how backreactions can mimic dark energy effects.

Lays groundwork for future quantitative analyses of backreaction impacts.

Abstract

The cosmological backreaction proposal, which attempts to account for observations without a primary dark energy source in the stress-energy tensor, has been developed and discussed by means of different approaches. Here, we focus on the concept of cosmological background solutions in order to develop a framework to study different backreaction proposals.