COSMOLOGICAL EVOLUTION OF EQUATION OF STATE FOR DARK ENERGY IN G-ESSENCE MODELS

2012/03/31 by Kazuharu Bamba, Olga Razina, Koblandy Yerzhanov +1
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Equation of state #Galaxies: Formation, Evolution, Phenomena #Mathematical physics #Physics #Quantum mechanics #Quintessence #Theoretical physics #Universe #physics.gen-ph

paper · pdf · doi:10.1142/s0218271813500235

published as International Journal of Modern Physics D 22 (2013) 1350023 · 33 pages, 21 figures, version accepted for publication in Int. J. Mod. Phys. D

arxiv created 2013/01/31 · openalex publication_date 2013/03/21 · arxiv updated 2013/05/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We explore the cosmological evolution of equation of state (EoS) for dark energy in g-essence models, the action of which is described by a function of both the canonical kinetic term of both the scalar and fermionic fields. We examine g-essence models with realizing the crossing of the phantom divide line of w DE = -1 as well as the models in which the universe always stays in the nonphantom (quintessence) phase (w DE > -1). In particular, we find an explicit g-essence model with the crossing from the nonphantom phase to the phantom one (w DE < -1). This transition behavior is consistent with the recent observational data analyses.

Citations

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Determining the equation of state of the expanding Universe: inverse problem in cosmology
• Prospects for probing the dark energy via supernova distance measurements
• Constraints on a variable dark energy model with recent observations
• f(R)theories of gravity
• Dark energy and dark gravity: theory overview
• Cosmology with a time-variable cosmological 'constant'
• Reconstructing Dark Energy
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Cosmological parameter analysis including SDSS Lyαforest and galaxy bias: Constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• Kinetic k-essence and quintessence
• Generalized Chaplygin gas, accelerated expansion, and dark-energy-matter unification
• Accelerating Universes with Scaling Dark Matter
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Dynamics of dark energy
• Cosmological consequences of a rolling homogeneous scalar field
• Kinetically driven quintessence
• Three‐YearWilkinson Microwave Anisotropy Probe(WMAP) Observations: Implications for Cosmology
• The galileon as a local modification of gravity
• FIVE-YEARWILKINSON MICROWAVE ANISOTROPY PROBEOBSERVATIONS: COSMOLOGICAL INTERPRETATION
• k-Inflation
• Covariant Galileon