Simplified Quartessence Cosmology

Abstract

We propose a new class of accelerating world models unifying the cosmological dark sector (dark matter and dark energy). All the models are described by a simplified version of the Chaplygin gas Quartessence cosmology. It is found that even for ${\Omega }_k\ne 0$, this Quartessence scenario depends only on a pair of parameters which can severely be constrained by the cosmological tests. As an example we perform a joint analysis involving the latest SNe type Ia data and the recent Sloan Digital Sky Survey measurement of baryon acoustic oscillations. In our analysis we have considered the SNe type Ia Union sample compiled by Kowalski et al. (2008). At 95.4% (c.l.), we find for BAO + Union sample, $\alpha =0.81_{-0.04}^{+0.04}$ and ${\Omega }_{Q4}=1.15_{-0.17}^{+0.16}$. The best fit for this simplified Quartessence scenario is a spatially closed Universe and its reduced ${\chi }^2$ is exactly the same of the flat concordance model (LambdaCDM)

5 pages, 4 figures. Changes in the abstract and the SNe Union data sample has been considered

References in corpus (57)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• The Cosmological Constant and Dark Energy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Cosmological Constant - the Weight of the Vacuum
• Cosmology and the Fate of Dilatation Symmetry
• An alternative to quintessence
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Can the dark energy equation-of-state parameter w be less than -1?
• Unification of Dark Matter and Dark Energy: the Inhomogeneous Chaplygin Gas
• CDM Models with a Smooth Component
• Extended tachyon field, Chaplygin gas and solvable k-essence cosmologies
• A Further Analysis of a Cosmological Model of Quintessence and Scalar Dark Matter
• Constraints on the generalized Chaplygin gas from supernovae observations
• The Revival of the Unified Dark Energy-Dark Matter Model ?
• Cosmology with x-matter
• Primordial Nucleosynthesis: Successes And Challenges
• Latest Supernova data in the framework of Generalized Chaplygin Gas model
• FRW Cosmologies with Adiabatic Matter Creation
• Quintessence and Scalar Dark Matter in the Universe
• New generalized Chaplygin gas as a scheme for unification of dark energy and dark matter
• Running G and Λat low energies from physics at M_X: possible cosmological and astrophysical implications
• Transition Redshift: New Kinematic Constraints from Supernovae
• Effect of inhomogeneities on the expansion rate of the Universe
• Thermodynamics of Decaying Vacuum Cosmologies
• High-redshift objects and the generalized Chaplygin gas
• Cosmology with a Variable Chaplygin Gas
• Generalizing the generalized Chaplygin gas
• Accelerating Cold Dark Matter Cosmology (${\Omega }_{\Lambda }\equiv 0$)
• Alternative Dark Energy Models: An Overview
• Scalar-field-dominated cosmology with a transient accelerating phase
• Dark Fluid: a complex scalar field to unify dark energy and dark matter
• The Role of Baryons in Unified Dark Matter Models
• Cosmological constraints on Chaplygin gas dark energy from galaxy clusters X-ray and supernova data
• Brans-Dicke Theory as a Unified Model for Dark Matter - Dark Energy
• Cosmon dark matter?
• Large-scale inhomogeneities in modified Chaplygin gas cosmologies
• Chaplygin gas dominated anisotropic brane world cosmological models
• New coupled quintessence cosmology
• Observational Constraints on Silent Quartessence
• Flat FRW Cosmologies with Adiabatic Matter Creation: Kinematic tests
• Difficulty of a spinning complex scalar field to be dark energy
• BBN And CMB Constraints On Dark Energy
• Measuring the Chaplygin gas equation of state from angular and luminosity distances
• Clustering, Angular Size and Dark Energy
• A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model
• A simplified approach for Chaplygin-type cosmologies
• Observational Evidence for Negative-Energy Dust in Late-Times Cosmology
• The Unified Equation of State for Dark Matter and Dark Energy
• CMB and LSS constraints on a single-field model of inflation
• Dark Matter as Dark Energy

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