Dark radiation as a signature of dark energy

TL;DR

This paper introduces a dark energy model predicting a detectable late-time dark radiation component with a distinctive evolving equation of state, potentially observable in colliders and consistent with current data.

Contribution

It presents a simple dark energy model that includes a late-time dark radiation component and can be tested through collider experiments.

Findings

Predicts a late-time dark radiation component compatible with current data

Produces a distinctive time-dependent equation of state w(z) for z < 3

Allows for collider detection of the dark energy field

Abstract

We propose a simple dark energy model with the following properties: the model predicts a late-time dark radiation component that is not ruled out by current observational data, but which produces a distinctive time-dependent equation of state w(z) for z < 3. The dark energy field can be coupled strongly enough to Standard Model particles to be detected in colliders, and the model requires only modest additional particle content and little or no fine-tuning other than a new energy scale of order milli-electron volts.