Freezing Out Early Dark Energy
Jannis Bielefeld, W. L. Kimmy Wu, Robert R. Caldwell, and Olivier Dore

TL;DR
This paper introduces a dark energy model that tracks matter early on and transitions rapidly, leaving observable imprints on cosmic structures and CMB, and explores its consistency with current data and future constraints.
Contribution
It presents a novel dark energy model with a rapid freeze-out transition and analyzes its observational signatures and parameter constraints using current cosmological data.
Findings
Transition could occur as late as redshift z~400
Model leaves detectable imprints on CMB and large-scale structure
Future experiments can tighten constraints on the model
Abstract
A phenomenological model of dark energy that tracks the baryonic and cold dark matter at early times but resembles a cosmological constant at late times is explored. In the transition between these two regimes, the dark energy density drops rapidly as if it were a relic species that freezes out, during which time the equation of state peaks at +1. Such an adjustment in the dark energy density, as it shifts from scaling to potential-domination, could be the signature of a trigger mechanism that helps explain the late-time cosmic acceleration. We show that the non-negligible dark energy density at early times, and the subsequent peak in the equation of state at the transition, leave an imprint on the cosmic microwave background anisotropy pattern and the rate of growth of large scale structure. The model introduces two new parameters, consisting of the present-day equation of state and…
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