N-BODY SIMULATIONS FOR EXTENDED QUINTESSENCE MODELS

@article{Li2011NBODYSF,
  title={N-BODY SIMULATIONS FOR EXTENDED QUINTESSENCE MODELS},
  author={Baojiu Li and D. Mota and J. Barrow},
  journal={The Astrophysical Journal},
  year={2011},
  volume={728},
  pages={109}
}
We introduce the N-body simulation technique to follow structure formation in linear and nonlinear regimes for the extended quintessence models (scalar-tensor theories in which the scalar field has a self-interaction potential and behaves as dark energy), and apply it to a class of models specified by an inverse power-law potential and a non-minimal coupling. Our full solution of the scalar field perturbation confirms that, when the potential does not change strongly on perturbation, the… Expand

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References

SHOWING 1-10 OF 78 REFERENCES
N-Body Simulations for Coupled Scalar Field Cosmology
We describe in detail the general methodology and numerical implementation of consistent N-body simulations for coupled-scalar-field models, including background cosmology and the generation ofExpand
STRUCTURE FORMATION BY FIFTH FORCE: POWER SPECTRUM FROM N-BODY SIMULATIONS
We lay out the framework to numerically study nonlinear structure formation in the context of scalar-field-coupled cold dark matter models (ϕCDM models) where the scalar field ϕ serves as dynamicalExpand
Self-Consistent Cosmological Simulations of DGP Braneworld Gravity
We perform cosmological N-body simulations of the Dvali-Gabadadze-Porrati (DGP) braneworld model, by solving the full nonlinear equations of motion for the scalar degree of freedom in this model, theExpand
Varying alpha from N-body Simulations
We have studied the Bekenstein-Sandvik-Barrow-Magueijo (BSBM) model for the spatial and temporal variations of the fine structure constant, alpha, with the aid of full N-body simulations whichExpand
Growth of perturbations in dark matter coupled with quintessence
We consider the evolution of linear perturbations in models with a nonminimal coupling between dark matter and scalar field dark energy. Growth of matter inhomogeneities in two examples of suchExpand
Non-linear evolution of f(R) cosmologies I: methodology
We introduce the method and the implementation of a cosmological simulation of a class of metric-variation f(R) models that accelerate the cosmological expansion without a cosmological constant andExpand
Nonlinear matter spectra in coupled quintessence
We consider cosmologies in which a dark-energy scalar field interacts with cold dark matter. The growth of perturbations is followed beyond the linear level by means of the time-renormalization-groupExpand
Perturbation evolution with a nonminimally coupled scalar field
We recently proposed a simple dilaton-derived quintessence model in which the scalar field was nonminimally coupled to cold dark matter, but not to ``visible'' matter. Such couplings can beExpand
Coupled dark energy: Parameter constraints from N-body simulations
We present the results of a series of N-body simulations in cosmologies where dark matter (DM) is coupled to dark energy (DE), so easing the cosmic coincidence problem. The dark-dark couplingExpand
Scalar tensor gravity and quintessence
Scalar fields with inverse power-law effective potentials may provide a negative pressure component to the energy density of the universe today, as required by cosmological observations. In order toExpand
...
1
2
3
4
5
...