Acceleration of the universe in matter dominant era by conformal symmetry breaking
arXiv:1305.5378 · doi:10.1007/s10773-013-1877-8
Abstract
We introduce a scenario in which the breakdown of conformal symmetry is responsible for the acceleration of universe in the matter dominant era. In this regard, we consider a self interacting scalar field non-minimally coupled to the Ricci scalar and the trace of energy-momentum tensor. For a traceless energy-momentum tensor in radiation dominant era, the coupling to matter vanishes and we are left with a conformal invariant gravitational action of Deser, where the universe may experience a decelerating phase in agreement with observations. In matter dominant era, the coupling to matter no longer vanishes, the conformal symmetry is broken down, and the matter inevitably becomes pressureless. The corresponding field equations are obtained and it is shown that the universe may have an accelerating phase in this era, provided that the value of self interaction coupling constant satisfies an specific lower bound. Moreover, we provide a reasonable solution to the coincidence problem.
13 pages. Int. J. Theor. Phys, published online (2013)
References in corpus (45)
- Dynamics of dark energy
- Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
- Cosmology and the Fate of Dilatation Symmetry
- Extended Theories of Gravity and their Cosmological and Astrophysical Applications
- Reconstructing Dark Energy
- Cosmological perturbations in f(T) gravity
- Dark energy cosmology from higher-order, string-inspired gravity and its reconstruction
- Construction of cosmologically viable f(G) gravity models
- Observational constraints on theory
- "Teleparallel" Dark Energy
- Cosmography in f(T)-gravity
- String-inspired Gauss-Bonnet gravity reconstructed from the universe expansion history and yielding the transition from matter dominance to dark energy
- The Cosmology of Modified Gauss-Bonnet Gravity
- Interacting holographic dark energy model in non-flat universe
- models with phantom divide line crossing
- Degrees of freedom of gravity
- Growth factor in f(T) gravity
- Observational information for f(T) theories and Dark Torsion
- Spherically symmetric static spacetimes in vacuum f(T) gravity
- Conformal transformation in theories
- Static Solutions with Spherical Symmetry in f(T) Theories
- Coupled oscillators as models of quintom dark energy
- On the CDM Universe in gravity
- Attractor Solutions in f(T) Cosmology
- A Tracker Solution for a Holographic Dark Energy Model
- Quintom model with O() symmetry
- Stability of the Einstein static universe in modified Gauss-Bonnet gravity
- Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field
- Interacting Modified Variable Chaplygin Gas in Non-flat Universe
- On the co-existence of matter dominated and accelerating solutions in f(G)-gravity
- The stability of the Einstein static state in gravity
- Generalized Brans-Dicke theories
- Emergent universe in chameleon, f(R) and f(T) gravity theories
- Constraints on coupling constant between dark energy and dark matter
- Interacting Dark Energy with Inhomogeneous Equation of State
- Pure kinetic k-essence as the cosmic speed-up
- Notes on dark energy interacting with dark matter and unparticle in loop quantum cosmology
- Perturbative aspects and conformal solutions of F(R) gravity
- Comment on "Einstein's Other Gravity and the Acceleration of the Universe''
- Cosmic coincidence problem and variable constants of physics
- Accelerating cosmology in F(T) gravity with scalar field
- Cosmic acceleration and crossing of in non-minimal modified Gauss-Bonnet gravity
- Cosmological entropy and generalized second law of thermodynamics in theory of gravity
- Liouville-like solutions in dilaton gravity with Gauss-Bonnet modifications
- Dark energy from conformal symmetry breaking