Non-linear Matter Spectrum for a Variable Equation of State

TL;DR

This paper investigates how non-linear matter spectrum features are affected by a variable dark energy equation of state, providing potential observational signatures to differentiate cosmological models.

Contribution

It introduces a method to analyze non-linear matter spectrum shifts caused by variable dark energy equations of state, enhancing model discrimination.

Findings

Non-linear corrections shift BAO spectrum features.

Spectrum shifts can distinguish different dark energy models.

Method enables testing of late-time dark energy variability.

Abstract

We study the growth of matter perturbations beyond the linear level in cosmologies in which the dark energy has a variable equation of state. The non-linear corrections result in shifts in the positions of the maximum, minima and nodes of the spectrum within the range of Baryon Acoustic Oscillations. These can be used in order to distinguish theories with different late-time variability of the equation of state.