Dark energy perturbations and a possible solution to the coincidence problem

TL;DR

This paper investigates dark energy perturbations and introduces an F-test to compare models with large scale structure data, demonstrating that the LXCDM model can address the coincidence problem.

Contribution

It analyzes dark energy perturbations and proposes a new test to evaluate models against large scale structure data, highlighting LXCDM as a viable solution to the coincidence problem.

Findings

LXCDM model fits large scale structure data well

Dark energy perturbations have generic properties analyzed

F-test effectively compares models with observations

Abstract

We analyze some generic properties of the dark energy (DE) perturbations, in the case of a self-conserved DE fluid. We also apply a simple test (the "F-test") to compare a model to the data on large scale structure (LSS) under the assumption of negligible DE perturbations. We exemplify our discussions by means of the LXCDM model, showing that it provides a viable solution to the cosmological coincidence problem.