Hybrid Chaplygin gas and phantom divide crossing

Abstract

Hybrid Chaplygin gas model is put forward, in which the gases play the role of dark energy. For this model the coincidence problem is greatly alleviated. The effective equation of state of the dark energy may cross the phantom divide $w=-1$. Furthermore, the crossing behaviour is decoupled from any gravity theories. In the present model, $w<-1$ is only a transient behaviour. There is a de Sitter attractor in the future infinity. Hence, the big rip singularity, which often afflicts the models with matter whose effective equation of state less than -1, is naturally disappear. There exist stable scaling solutions, both at the early universe and the late universe. We discuss the perturbation growth of this model. We find that the index is consistent with observations.

11 pages, 4 figures, V3: discussions on the perturbation growth added, V4: minor corrections, to match the published version

References in corpus (22)

• Dynamics of dark energy
• Cosmological Evolution of a Quintom Model of Dark Energy
• Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes
• Dark Energy versus Modified Gravity
• Dynamical vacuum energy, holographic quintom, and the reconstruction of scalar-field dark energy
• Generalized Second Law of Thermodynamics in Quintom Dominated Universe
• Separating Dark Physics from Physical Darkness: Minimalist Modified Gravity vs. Dark Energy
• On the growth of linear perturbations
• Interacting Vector-like Dark Energy, the First and Second Cosmological Coincidence Problems
• Cosmic Duality in Quintom Universe
• Quintom cosmologies admitting either tracking or phantom attractors
• Interacting Phantom Energy
• Is Modified Gravity Required by Observations? An Empirical Consistency Test of Dark Energy Models
• Late acceleration and $w=-1$ crossing in induced gravity
• Transition from quintessence to phantom phase in quintom model
• A Note on Crossing the Phantom Divide in Hybrid Dark Energy Model
• Comparison of Approaches to Quantum Correction of Black Hole Thermodynamics
• Crossing $w=-1$ by a single scalar on a Dvali-Gabadadze-Porrati brane
• Critical comments on the paper "Crossing $\omega =-1$ by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)]
• The cosmological constant and dark energy in braneworlds
• Supernova Ia and Galaxy Cluster Gas Mass Fraction Constraints on Dark Energy
• Constraints on alternative models to dark energy

Cited by in corpus (7)

• New mechanism to cross the phantom divide
• Brane tachyon dynamics
• Observational constraints on Chaplygin cosmology in a braneworld scenario with induced gravity and curvature effect
• Braneworld cosmology in the sourced-Taub background
• On the cosmological viability of the Hu-Sawicki type modified induced gravity
• The Osgood Criterion and Finite-Time Cosmological Singularities
• $\Lambda$CDM, $\Lambda$DGP and extended phantom-like cosmologies