$\Lambda$ is Coming: Parametrizing Freezing Fields

Abstract

We explore freezing dark energy, where the evolution of the field approaches that of a cosmological constant at late times. We propose two general, two parameter forms to describe the class of freezing field models, in analogy to ones for thawing fields, here based on the physics of the flow parameter or the calibrated $w$-$w^{\prime }$ phase space. Observables such as distances and Hubble parameters are fit to within 0.1%, and the dark energy equation of state generally to within better than 1%, of the exact numerical solutions.

5 pages, 2 figures; v2 minor changes to match published version

References in corpus (8)

• Cosmology and the Fate of Dilatation Symmetry
• Thawing quintessence with a nearly flat potential
• The Dynamics of Quintessence, The Quintessence of Dynamics
• Hilltop Quintessence
• Calibrating Dark Energy
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Cited by in corpus (2)

• Narrowing down the possible explanations of cosmic acceleration with geometric probes
• Discerning Dark Energy Models with High-Redshift Standard Candles