Two-Field Quintom Models in the w-w' Plane

Abstract

The w-w' plane, defined by the equation of state parameter for the dark energy and its derivative with respect to the logarithm of the scale factor, is useful to the study of classifying the dynamical dark energy models. In this note, we examine the evolving behavior of the two-field quintom models with w crossing the w=-1 barrier in the w-w' plane. We find that these models can be divided into two categories, type A quintom in which w changes from >-1 to <-1 and type B quintom in which w changes from <-1 to >-1 as the universe expands.

5 pages, 2 figures, RevTeX, Accepted for publication as a Brief Report in Physical Review D

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• Statefinder diagnosis for the interacting model of holographic dark energy
• Statefinder Diagnostic and w-w' Analysis for the Agegraphic Dark Energy Models without and with Interaction
• Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
• On Perturbations of Quintom Bounce
• Age Problem in the Holographic Dark Energy Model
• Holographic Dark Energy in Braneworld Models with Moving Branes and the w=-1 Crossing
• Dynamics of interacting phantom scalar field dark energy in Loop Quantum Cosmology
• Analytic spectrum of relic gravitational waves modified by neutrino free streaming and dark energy
• Dynamics of Quintom and Hessence Energies in Loop Quantum Cosmology
• UV stable, Lorentz-violating dark energy with transient phantom era
• Chaplygin DGP cosmologies
• 3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological Constraints
• Route to Lambda in conformally coupled phantom cosmology
• Dilaton Coupled Quintessence Model in the $\omega -{\omega }^{\prime }$ Plane
• Asymptotic behavior of w in general quintom model
• Born-Infeld Type Phantom Model in the $\omega -{\omega }^{\prime }$ Plane
• Reconstructing the properties of dark energy from recent observations
• How to Measure the Cosmic Curvature