Dark Energy, with Signatures

TL;DR

This paper introduces a simple dark energy model predicting a late-time dark radiation component and a distinctive evolving equation of state, with potential collider detectability and minimal fine-tuning.

Contribution

It presents a new class of dark energy models with observable signatures and strong coupling to Standard Model particles, requiring modest additional particles and a new energy scale.

Findings

Predicts a late-time dark radiation component

Features a distinctive time-dependent equation of state w(z)

Suggests potential collider detection of the dark energy field

Abstract

We propose a class of simple dark energy models which predict a late-time dark radiation component and a distinctive time-dependent equation of state $w(z)$ for redshift $z < 3$. 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.