Old Dark Energy

Abstract

Dark energy dynamics in the recent universe is influenced by its evolution through the long, matter dominated expansion history. A particular dynamical property, the flow variable, remains constant in several classes of scalar field models as long as matter dominates; the dark energy is only free to diverge in behavior at recent times. This gives natural initial conditions for Monte Carlo studies of dark energy dynamics. We propose a parametrization for the later evolution that covers a wide range of possible behaviors, is tractable in making predictions, and can be constrained by observations. We compare the approach to directly parametrizing the potential, which does not take into account the maturity of the dark energy dynamics.

12 pages, 11 figures. Accepted for publication in Phys Rev D.

References in corpus (9)

• Cosmology and the Fate of Dilatation Symmetry
• Thawing quintessence with a nearly flat potential
• The Dynamics of Quintessence, The Quintessence of Dynamics
• Dynamical behavior of generic quintessence potentials: constraints on key dark energy observables
• Impact of three years of data from the Wilkinson Microwave Anisotropy Probe on cosmological models with dynamical dark energy
• Quintessence reconstructed: new constraints and tracker viability
• Measuring deviations from a cosmological constant: a field-space parameterization
• Observational constraints on thawing quintessence models
• Statistical methods for cosmological parameter selection and estimation

Cited by in corpus (6)

• Slow-roll freezing quintessence
• Constraints on field flows of quintessence dark energy
• Reconstructing Quintessence
• The Dark Energy Cosmic Clock: A New Way to Parametrise the Equation of State
• $\Lambda$ is Coming: Parametrizing Freezing Fields
• Beyond dark energy Fisher forecasts: how DESI will constrain LCDM and quintessence models