Calibrating Dark Energy

TL;DR

This paper introduces a calibration relation for dark energy dynamics, linking the amplitude of its equation of state variation to a new parameter that accurately predicts cosmological observables.

Contribution

It proposes a novel calibration method for dark energy models, improving the accuracy of observable predictions and informing future dark energy research strategies.

Findings

Calibration factor closely related to w_a parameter

Calibrated w_a predicts distance and Hubble parameter with 10^{-3} accuracy

Defines homogeneous families of dark energy physics

Abstract

Exploring the diversity of dark energy dynamics, we discover a calibration relation, a uniform stretching of the amplitude of the equation of state time variation with scale factor. This defines homogeneous families of dark energy physics. The calibration factor has a close relation to the standard time variation parameter w_a, and we show that the new, calibrated w_a describes observables, i.e. distance and Hubble parameter as a function of redshift, typically to an accuracy level of 10^{-3}. We discuss implications for figures of merit for dark energy science programs.