Spectra of dynamical Dark Energy cosmologies from constant-w models

TL;DR

This paper explores how constant-w dark energy models can replicate the spectra of more complex dynamical dark energy models within a 1% margin, aiding in understanding cosmological data constraints.

Contribution

It introduces a method to reconstruct spectra of dynamical dark energy models using constant-w models, simplifying analysis of cosmological data.

Findings

Constant-w models can match dynamical dark energy spectra within 1%.

A numerical method to rebuild likelihood ellipses on the w_0-w_a plane.

Provides a spectral map of acceptable constant-w models.

Abstract

WMAP5 and related data have greatly restricted the range of acceptable cosmologies, by providing precise likelihood ellypses on the the w_0-w_a plane. We discuss first how such ellypses can be numerically rebuilt, and present then a map of constant-w models whose spectra, at various redshift, are expected to coincide with acceptable models within ~1%.