A Note on Crossing the Phantom Divide in Hybrid Dark Energy Model

Abstract

Recently a lot of attention has been given to building dark energy models in which the equation-of-state parameter $w$ can cross the phantom divide $w=-1$. However, to our knowledge, these models with crossing the phantom divide only provide the possibility that $w$ can cross -1. They do not answer another question: {\em why crossing phantom divide occurs recently?} Since in many existing models whose equation-of-state parameter can cross the phantom divide, $w$ undulates around -1 randomly, {\em why are we living in an epoch $w<-1$?} This can be regarded as the second cosmological coincidence problem. In this note, we propose a possible approach to alleviate this problem within a hybrid dark energy model.

9 pages, 3 figures, Latex2e; v2: references added; v3: discussions added, accepted by Phys.Lett.B; v4: published version

References in corpus (3)

• Cosmology and the Fate of Dilatation Symmetry
• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?

Cited by in corpus (66)

• Dynamics of dark energy
• Quintom Cosmology: Theoretical implications and observations
• Dark energy in modified Gauss-Bonnet gravity: late-time acceleration and the hierarchy problem
• Dynamical vacuum energy, holographic quintom, and the reconstruction of scalar-field dark energy
• Reconstructing holographic quintessence
• Dark Energy with Phantom Crossing and the $H_0$ tension
• Cosmological coincidence problem in interacting dark energy models
• Interacting Vector-like Dark Energy, the First and Second Cosmological Coincidence Problems
• Crossing of the phantom divide in modified gravity
• Quintom cosmologies admitting either tracking or phantom attractors
• Quintom cosmologies with arbitrary potentials
• Two-Field Quintom Models in the w-w' Plane
• Gauss-Bonnet cosmologies: crossing the phantom divide and the transition from matter dominance to dark energy
• Observational $H(z)$ Data and Cosmological Models
• On the way from matter-dominated era to dark energy universe
• Age Problem in the Holographic Dark Energy Model
• Bouncing and Accelerating Solutions in Nonlocal Stringy Models
• Evolving Newton's Constant, Extended Gravity Theories and SnIa Data Analysis
• Late acceleration and $w=-1$ crossing in induced gravity
• Parikh-Wilczek Tunneling from Noncommutative Higher Dimensional Black Holes
• Internal space structure generalization of the quintom cosmological scenario
• Crossing $w=-1$ by a single scalar on a Dvali-Gabadadze-Porrati brane
• Dynamics in Nonlocal Cosmological Models Derived from String Field Theory
• 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)]
• Reconstruction of Hessence Dark Energy and the Latest Type Ia Supernovae Gold Dataset
• The past and future dynamics of quintom dark energy models
• Non-local SFT Tachyon and Cosmology
• Cosmic acceleration and crossing of w=-1 barrier in non-local Cubic Superstring Field Theory model
• A New Approach to Quintessence and a Solution of Multiple Attractors
• Dynamics of Quintom and Hessence Energies in Loop Quantum Cosmology
• General solution of scalar field cosmology with a (piecewise) exponential potential
• Particle vs. future event horizon in interacting holographic dark energy model
• Cheng-Weyl Vector Field and its Cosmological Application
• Braneworld dynamics in Einstein-Gauss-Bonnet gravity
• Crossing the phantom barrier with purely kinetic multiple k-essence
• Stable Models of superacceleration
• Black Holes in the Universe: Generalized Lemaitre-Tolman-Bondi Solutions
• Crossing of the w=-1 Barrier in Two-Fluid Viscous Modified Gravity
• Exact models with non-minimal interaction between dark matter and (either phantom or quintessence) dark energy
• Gauss-Bonnet Chameleon Mechanism of Dark Energy
• Natural Phantom Dark Energy, Wiggling Hubble Parameter $H(z)$ and Direct $H(z)$ Data
• Late-time acceleration and Phantom Divide Line Crossing with Non-minimal Coupling and Lorentz Invariance Violation
• Cosmological Evolution of a Tachyon-Quintom Model of Dark Energy
• Reconstruction of scalar potentials in two-field cosmological models
• Crossing of the Phantom Divided Barrier with Lorentz Invariance Violating Fields
• Networks of cosmological histories, crossing of the phantom divide line and potentials with cusps
• Attractor Solution in Coupled Yang-Mills Field Dark Energy Models
• Symmetry breaking and the onset of cosmic acceleration in scalar field models
• Phantom universe from CPT symmetric QFT
• Chameleon Cosmology Model Describing the Phantom Divide Line Crossing
• Crossing the phantom divide line in universal extra dimensions
• Maximally localized states and quantum corrections of black hole thermodynamics in the framework of a new generalized uncertainty principle
• Falsifying Field-based Dark Energy Models
• Two-Fluid Viscous Modified Gravity on a RS Brane
• Fractional Einstein-Gauss-Bonnet scalar field cosmology
• A Lorentz Invariance Violating Cosmology on the DGP Brane
• Qualitative analysis and characterization of two cosmologies including scalar fields
• Hybrid Chaplygin gas and phantom divide crossing
• Braneworld cosmology in the sourced-Taub background
• Reconstructing quintom from WMAP 5-year observations: Generalized ghost condensate
• Cosmic acceleration in screening hybrid quintessence model
• Black Holes in Accelerated Universe
• Considering Late-Time Acceleration in some Cosmological Models
• Crossing the phantom divide with a classical Dirac field
• Inflation is the generic feature of phantom field-not the big-rip
• Parameterization and Reconstruction of Quasi Static Universe