Instability of Chaplygin gas trajectories in unified dark matter models

Abstract

In the past few years, the Chaplygin gas (CG) has been considered as an appealing candidate for unifying dark matter and dark energy into a single substance. This picture had to face several problems when trying to fit its predictions with cosmological observations. We point out another potential problem of this model, showing that, when the CG is described through a classical scalar field, the corresponding trajectories are strongly unstable. This implies that an extreme fine tuning must apply to the initial values of the field in order to end up today with values allowed by observational data.

arXiv comment5 pages, 2 figures

References in corpus (47)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological Imprint of an Energy Component with General Equation of State
• Cosmology and the Fate of Dilatation Symmetry
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• The Cosmological Constant
• An alternative to quintessence
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
• Cosmological Tracking Solutions
• The Cosmic Triangle: Revealing the State of the Universe
• Quintessence and the Rest of the World
• Accelerated expansion of the universe driven by tachyonic matter
• Unification of Dark Matter and Dark Energy: the Inhomogeneous Chaplygin Gas
• Field Theory of Tachyon Matter
• Cosmological Evolution of the Rolling Tachyon
• Cosmology with tachyon field as dark energy
• Can the Chaplygin gas be a plausible model for dark energy?
• Can the clustered dark matter and the smooth dark energy arise from the same scalar field ?
• The end of unified dark matter?
• Extended Quintessence
• Tachyons, Scalar Fields and Cosmology
• Extended tachyon field, Chaplygin gas and solvable k-essence cosmologies
• WMAP and the Generalized Chaplygin Gas
• Constraints on the generalized Chaplygin gas from supernovae observations
• A comparison of cosmological models using recent supernova data
• Cosmological consequences of a Chaplygin gas dark energy
• Are Chaplygin gases serious contenders to the dark energy throne?
• Latest Supernova data in the framework of Generalized Chaplygin Gas model
• Generalized Chaplygin gas as a unified scenario of dark matter/energy: observational constraints
• The Dynamics of Relativistic Membranes I: Reduction to 2-dimensional Fluid Dynamics
• Cosmological Effects of a Class of Fluid Dark Energy Models
• High-redshift objects and the generalized Chaplygin gas
• Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints
• Expected constraints on the generalized Chaplygin equation of state from future supernova experiments and gravitational lensing statistics
• Constraints on Chaplygin quartessence from the CLASS gravitational lens statistics and supernova data
• Alternatives to Quintessence Model Building
• Large scale structure and the generalised Chaplygin gas as dark energy
• Supersymmetric Fluid Mechanics
• The Role of Baryons in Unified Dark Matter Models
• Cosmological constraints on Chaplygin gas dark energy from galaxy clusters X-ray and supernova data
• Entropy perturbations in quartessence Chaplygin models
• Dark energy, dissipation and the coincidence problem
• Mass Power Spectrum in a Universe Dominated by the Chaplygin Gas
• Stability of FRW Cosmology with Generalized Chaplygin Gas
• Unified Model for Dark Energy
• On the problem of equation of state for the $\Lambda$ - field

Cited by in corpus (17)

• Dynamics of dark energy
• Interacting Chaplygin gas
• Stability properties of some perfect fluid cosmological models
• Dark Energy in Practice
• Extended Born-Infeld Dynamics and Cosmology
• An entirely analytical cosmological model
• A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model
• Revisiting Chaplygin gas cosmologies with the recent observations of high-redshfit quasars
• A hybrid model of viscous and Chaplygin gas to tackle the Universe acceleration
• Spatial Ricci scalar dark energy model
• Single-field inflation à la generalized Chaplygin gas
• Constraints on the generalized tachyon field models from latest observational data
• Quintessence as k-essence
• Global cosmological dynamics for the scalar field representation of the modified Chaplygin gas
• Observational Constraints on the Generalized Chaplygin Gas
• A Comparison of Quintessence and Nonlinear Born-Infeld Scalar Field Using Gold Supernova data
• Detectability of Cosmic Topology in Generalized Chaplygin Gas Models