Cosmological Evolution of a Quintom Model of Dark Energy

Abstract

We investigate in this paper the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic energy term. For such a system with exponential potentials we find that during the evolution of the universe the equation of state $w$ changes from $w>-1$ to $w<-1$, which is consistent with the recent observations. A phase-plane analysis shows that the "phantom"-dominated scaling solution is the stable late-time attractor of this type of models.

9 pages, 3 figures, LaTeX2e

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• Scalar Field Kantowski--Sachs Solutions in Teleparallel $F(T)$ Gravity
• Anisotropic Dark Energy and the Generalized Second Law of Thermodynamics
• Scalar Dark Energy Models and Scalar-Tensor Gravity: Theoretical Explanations for the Accelerated Expansion of Present Universe
• Cosmology with higher-derivative matter fields
• Cosmological observations in non-local $F(R)$ cosmology
• Interacting Three Fluid System and Thermodynamics of the Universe Bounded by the Event Horizon
• Chameleon gravity on cosmological scales
• Scalar field source Teleparallel Robertson-Walker F(T)-gravity solutions
• A cosmological model of the early universe based on ECG with variable $\Lambda$-term in Lyra geometry
• Equilibrium sets in quintom cosmologies: the past asymptotic dynamics
• Quintessence and phantom emerging from the split-complex field and the split-quaternion field
• Investigation of Bouncing Universe and Phantom Crossing in Modified Gravity Coupled with Weyl Tensor and its Reconstruction
• Friedmann-Robertson-Walker Models with Late-Time Acceleration
• Cosmological models based on a complex scalar field with a power-law potential associated with a polytropic equation of state
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Lensing amplitude anomaly and varying electron mass alleviate the Hubble and $S_8$ tensions
• Dynamics of the self-interacting chameleon cosmology
• Crossing of the Cosmological Constant Boundary - an Equation of State Description
• Constraining Dynamical Dark Energy Models through the Abundance of High-Redshift Supermassive Black Holes
• Non-Minimal Cosmological Model in Modified Yang--Mills Theory
• The torsion cosmology in Kaluza-Klein theory
• Transient dark energy, cosmological constant boundary crossing and dark energy $w(z)$ data fits
• Evidence for the dynamical dark energy with evolving Hubble constant
• Interacting non-minimally coupled canonical, phantom and quintom models of holographic dark energy in non-flat universe
• Cosmological consequences of a scalar field with oscillating equation of state. IV. Primordial nucleosynthesis and the deuterium problem
• The coincidence problem in $f(R)$ gravity models
• Addressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced $H_0$ Tension with Reconstructed Scalar-Tensor Gravity
• Crossing the phantom divide with a classical Dirac field
• Cosmological evolutions of $F(R)$ nonlinear massive gravity
• Realizing the phantom-divide crossing with vector and scalar fields
• Viscous interacting and stability on dark matter Bose-Einstein condensation with modified Chaplygin gas
• Power Law and Logarithmic Ricci Dark Energy Models in Horava-Lifshitz Cosmology
• Accelerating Universe: Observational Status and Theoretical Implications
• $f(R)$ Gravity and Crossing the Phantom Divide Barrier
• Exploring the deviation of cosmological constant by a generalized pressure dark energy model
• Latest Cosmological Constraints on Cardassian expansion models including the updated Gamma-ray bursts
• Phase Space Analysis for Anisotropic Universe with Nonlinear Bulk Viscosity
• Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes
• A short review on Quintom dark energy theory
• The Effects of Tachyonic and Phantom Fields in the Intermediate and Logamediate Scenarios of the Anisotropic Universe
• Phantom BTZ black holes
• Potentials of Coupled Quintessence Based on a Dilaton
• Coupling q-deformed dark energy to dark matter
• A unification of RDE model and XCDM model
• Asymptotically Static Universe
• Quintom Dark Energy: Future Attractor and Phantom Crossing in Light of DESI DR2 Observation
• Weak Gravity Conjecture and Holographic Dark Energy Model with Interaction and Spatial Curvature
• ${\mathbf{\Omega }}_1{\mathbf{\Omega }}_2$-$\mathbf{\Lambda }$CDM: A promising phenomenological extension of the standard model of cosmology
• Reconstructing cosmic evolution with a density parametrization
• Matter Creation Cosmologies and Accelerated Expansion
• A new approach to modified-gravity models
• Scalar Field Static Spherically Symmetric Solutions in Teleparallel $F(T)$ Gravity
• Apparent $w<-1$ and a Lower $S_8$ from Dark Axion and Dark Baryons Interactions
• Parameterization and Reconstruction of Quasi Static Universe
• Thermodynamical aspects of modified holographic dark energy model
• Bianchi type-III THDE quintessence model with hybrid expansion law
• About the triviality of the higher derivative sector in the abelian Lee-Wick model
• Generalized Semi-Holographic Universe
• Evolution of the horizons for dark energy universe
• Agegraphic dark energy from entropy of the anti-de Sitter black hole
• Phase space of multi-fluid universe in $F(T)$-gravity and some enhancements for the oscillating interaction model
• Phantom Crossing with Quintom Models
• The relation between Geometry and Matter in classical and quantum Gravity and Cosmology
• Observational Constraints and Cosmological Dynamics of Interacting Fractional Holographic Dark Energy in Light of DESI DR2
• Reconstructing the Equation of State for Dark Energy In the Double Complex Symmetric Gravitational Theory
• Geodesics and Bending of Light around a BTZ Black Hole Surrounded by Quintessential Matter
• Interacting dark matter and q-deformed dark energy non-minimally coupled to gravity
• Evolution and thermodynamics of new holographic dark energy with bulk viscosity in modified $f(R,T)$ gravity
• Chaplygin and Polytropic gases Teleparallel Robertson-Walker $F(T)$ gravity solutions