Backreaction of superhorizon perturbations in scalar field cosmologies
arXiv:0808.1043 · doi:10.1103/PhysRevD.78.063537
Abstract
It has been suggested that the acceleration of the Universe may be due to the backreaction of perturbations to the Friedmann-Robertson-Walker background. For a Universe dominated by cold dark matter, it is known that the backreaction of superhorizon perturbations can not drive acceleration. We extend this result to models with cold dark matter together with a scalar field. We show that the scalar field can drive acceleration only via the standard mechanism of a constant or nearly constant piece of its potential (i.e., a cosmological constant); there is no separate mechanism involving superhorizon backreaction. This rules out some models which have been proposed in the literature.
arXiv comment5 pages
References in corpus (38)
- Dynamics of dark energy
- 4D Gravity on a Brane in 5D Minkowski Space
- Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
- On average properties of inhomogeneous fluids in general relativity I: dust cosmologies
- Avoiding Dark Energy with 1/R Modifications of Gravity
- Reconciling dark energy models with f(R) theories
- Dark Energy from structure: a status report
- The motion of point particles in curved spacetime
- On the Back Reaction Problem for Gravitational Perturbations
- The Energy-Momentum Tensor for Cosmological Perturbations
- On average properties of inhomogeneous fluids in general relativity II: perfect fluid cosmologies
- An inhomogeneous alternative to dark energy?
- On cosmic acceleration without dark energy
- The Phenomenology of Dvali-Gabadadze-Porrati Cosmologies
- Dark energy from backreaction
- Can the Acceleration of Our Universe Be Explained by the Effects of Inhomogeneities?
- On the one loop corrections to inflation and the CMB anisotropies
- Back Reaction And Local Cosmological Expansion Rate
- Effect of inhomogeneities on the expansion rate of the Universe
- Accelerated expansion from structure formation
- One-loop corrections to a scalar field during inflation
- On the way from matter-dominated era to dark energy universe
- The Effect of Inhomogeneities on the Luminosity Distance-Redshift Relation: is Dark Energy Necessary in a Perturbed Universe?
- Can superhorizon cosmological perturbations explain the acceleration of the universe?
- Light-cone averages in a swiss-cheese universe
- Modified gravity as an alternative for Lambda-CDM cosmology
- Back Reaction Of Perturbations In Two Scalar Field Inflationary Models
- Can inhomogeneties accelerate the cosmic volume expansion?
- Long-wavelength metric backreactions in slow-roll inflation
- Can superhorizon perturbations drive the acceleration of the Universe?
- A New Perspective on DGP Gravity
- Do Large-Scale Inhomogeneities Explain Away Dark Energy?
- A cosmic equation of state for the inhomogeneous Universe: can a global far-from-equilibrium state explain Dark Energy?
- Cosmological Backreaction from Perturbations
- DGP Cosmology with a Non-Minimally Coupled Scalar Field on the Brane
- The transition of equation of state of effective dark energy in the DGP model with bulk contents
- Can a dust dominated universe have accelerated expansion?
- Back-reaction of Cosmological Fluctuations during Power-Law Inflation
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- Dark Energy
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- Is backreaction really small within concordance cosmology?
- How unitary cosmology generalizes thermodynamics and solves the inflationary entropy problem
- Observational Constraints on the Averaged Universe
- Evidence for the Fifth Element Astrophysical status of Dark Energy
- The Averaging Problem in Cosmology