Unified Model for Dark Energy

Abstract

A new model for the universe filled with a generalized Chaplygin fluid is considered which unitarily describes as a single vacuum entity both a quintessence scalar field and a cosmological constant, so unifying the notion of dark energy. While the evolution of the universe filled with such a fluid does not obviously contradict the present cosmic acceleration, the introduced single dark-energy component, for equations of state with characteristic parameter $\omega \ge -1$, behaves like an usual quintessence fluid with constant equation of state at early high densities, and like a pure cosmological constant at late cosmological times.

5 pages, some misprints corrected, a comment on the initial equation of state inserted, one reference added

References in corpus (4)

• Cosmology and the Fate of Dilatation Symmetry
• Can the Chaplygin gas be a plausible model for dark energy?
• Constraints on the generalized Chaplygin gas from supernovae observations
• Cosmological consequences of a Chaplygin gas dark energy

Cited by in corpus (29)

• Quintom Cosmology: Theoretical implications and observations
• WMAP constraints on low redshift evolution of dark energy
• Dark Energy and Gravity
• Observational constraints on low redshift evolution of dark energy: How consistent are different observations?
• Bulk viscous cosmology: statefinder and entropy
• Cosmology with a Variable Chaplygin Gas
• Constraints on Chaplygin quartessence from the CLASS gravitational lens statistics and supernova data
• Dark Energy Model with Spinor Matter and Its Quintom Scenario
• Cosmological constraints on Chaplygin gas dark energy from galaxy clusters X-ray and supernova data
• Shear and rotation in Chaplygin cosmology
• Wormholes and Ringholes in a Dark-Energy Universe
• Scalar Field Dark Energy Perturbations and their Scale Dependence
• Tachyon-Chaplygin inflationary universe model
• Chaplygin inflation on the brane
• Measuring the Chaplygin gas equation of state from angular and luminosity distances
• Generalized Chaplygin gas as geometrical dark energy
• Warm-Chaplygin inflationary universe model
• Why Does Gravity Ignore the Vacuum Energy?
• Stochastic gravitational waves from a new type of modified Chaplygin gas
• Complementary constraints from FR IIb radio galaxies and X-ray gas mass fractions in clusters on non-standard cosmological models
• Nonparametric reconstruction of the Om diagnostic to test LCDM
• Tachyon-Chaplygin inflation on the brane
• Instability of Chaplygin gas trajectories in unified dark matter models
• Study of Inflationary Generalized Cosmic Chaplygin Gas for Standard and Tachyon Scalar Fields
• Evolution of perturbations in distinct classes of canonical scalar field models of dark energy
• Sub-Quantum Dark Energy
• Role of Chaplygin gas as geometrical dark energy in anisotropic brane gravity
• Thermodynamic modifications to Bardeen black holes surrounded by quintessence based on the new higher order GUP
• Dynamical friction shear and rotation in Chaplygin cosmology