$\Lambda$ 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 (18)

• 4D Gravity on a Brane in 5D Minkowski Space
• Cosmology and the Fate of Dilatation Symmetry
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• Exploring the Expansion History of the Universe
• Cosmology with a Primordial Scaling Field
• A classification of scalar field potentials with cosmological scaling solutions
• Quintessence and Supergravity
• Thawing quintessence with a nearly flat potential
• The Dynamics of Quintessence, The Quintessence of Dynamics
• The Paths of Quintessence
• Hilltop Quintessence
• Slow-Roll Thawing Quintessence
• Calibrating Dark Energy
• Measuring deviations from a cosmological constant: a field-space parameterization
• Quintessence's Last Stand?
• Field Flows of Dark Energy
• Parameterizing and Measuring Dark Energy Trajectories from Late-Inflatons
• Old Dark Energy

Cited by in corpus (6)

• New tracker models of dark energy
• Narrowing down the possible explanations of cosmic acceleration with geometric probes
• Constraints on field flows of quintessence dark energy
• Pole Dark Energy
• Discerning Dark Energy Models with High-Redshift Standard Candles
• Dark energy with $w\to -1$: Asymptotic $\Lambda$ versus pseudo-$\Lambda$