A class of transient acceleration models consistent with Big Bang Cosmology

Abstract

Is it possible that the current cosmic accelerating expansion will turn into a decelerating one? Can this transition be realized by some viable theoretical model that is consistent with the standard Big Bang cosmology? We study a class of phenomenological models of a transient acceleration, based on a dynamical dark energy with a very general form of equation of state $p_{de}=\alpha {\rho }_{de}-\beta {\rho }_{de}^m$. It mimics the cosmological constant ${\rho }_{de}\to$ const for small scale factor $a$, and behaves as a barotropic gas with ${\rho }_{de}\to a^{-3(\alpha +1)}$ with $\alpha \ge 0$ for large $a$. The cosmic evolution of four models in the class has been examined in details, and all yields a smooth transient acceleration. Depending on the specific model, the future universe may be dominated either by the dark energy or by the matter. In two models, the dynamical dark energy can be explicitly realized by a scalar field with an analytical potential $V(\varphi )$. Moreover, the statistical analysis shows that the models can be as robust as $\Lambda$CDM in confronting the observational data of SN Ia, CMB, and BAO. As improvements over the previous studies, our models overcome the over-abundance problem of dark energy during early eras, and satisfy the constraints on the dark energy from WMAP observations of CMB.

11 pages, 8 figures. To be published in RAA

References in corpus (20)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• Scalar-field-dominated cosmology with a transient accelerating phase
• 2-loop Quantum Yang-Mills Condensate as Dark Energy
• Yang-Mills condensate dark energy coupled with matter and radiation
• The transient acceleration from time-dependent interacting dark energy models
• 3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological Constraints
• Brane assisted quintessential inflation with transient acceleration
• Cosmological constant and late transient acceleration of the universe in the Horava-Witten Heterotic M-Theory on S^{1}/Z_{2}
• Early and Late Transient Cosmic Acceleration due to Curvature Inspired Dark Energy
• Holographic dark energy and late cosmic acceleration
• Coupled quintessence with a possible transient accelerating phase
• Crossing $w=-1$ by a single scalar field coupling with matter and the observational constraints
• Late transient acceleration of the universe in string theory on $S^1/Z_2$
• Transient Accelerating Scalar Models with Exponential Potential
• Observational constraints on a Yang-Mills condensate dark energy model

Cited by in corpus (1)

• Interacting Viscous Dark Energy in Bianchi Type-III Universe