Quintom evolution in power-law potentials

Abstract

We investigate quintom evolution in power-law potentials. We extract the early-time, tracker solutions, under the assumption of matter domination. Additionally, we derive analytical solutions at intermediate times, that is at low redshifts, which is the period during the transition from matter to dark-energy domination. A comparison with exact evolution reveals that the tracker solutions are valid within 98% for z>1.5, while the intermediate ones are accurate within 98% up to z=0.5. Using these expressions we extract two new w-parametrizations, one in terms of the redshift and one in terms of the dark-energy density-parameter, and we present various quintom evolution sub-classes, including quintessence-like or phantom-like cases, realization of the -1-crossing, and non-monotonic w-evolution.

12 pages, 6 figures

References in corpus (24)

• Dynamics of dark energy
• Cosmology and the Fate of Dilatation Symmetry
• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?
• Avoiding Dark Energy with 1/R Modifications of Gravity
• Thawing quintessence with a nearly flat potential
• Non-minimally coupled canonical, phantom and quintom models of holographic dark energy
• Cosmological Evolution of Interacting Phantom Energy with Dark Matter
• Coupled oscillators as models of quintom dark energy
• Cosmic Duality in Quintom Universe
• Quintom cosmologies admitting either tracking or phantom attractors
• Parametrizations of the Dark Energy Density and Scalar Potentials
• Observational $H(z)$ Data and Cosmological Models
• Quintom model with O($N$) symmetry
• Top ten accelerating cosmological models
• Late acceleration and $w=-1$ crossing in induced gravity
• Crossing $w=-1$ by a single scalar on a Dvali-Gabadadze-Porrati brane
• Critical comments on the paper "Crossing $\omega =-1$ by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)]
• Phantom Dark Energy Models with a Nearly Flat Potential
• Energy conditions and current acceleration of the universe
• Quintom dark energy models with nearly flat potentials
• Crossing the phantom divide in an interacting generalized Chaplygin gas
• Extended Quintessence with non-minimally coupled phantom scalar field
• Statistical Approach to the Cosmological-Constant Problem on Brane Worlds

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