# 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

#### Figures and Tables from this paper

#### 46 Citations

Cosmological simulations with disformally coupled symmetron fields

- Physics
- 2015

Context. We investigate statistical properties of the distribution of matter at redshift zero in disformal gravity by using N-body simulations. The disformal model studied here consists of a… Expand

Varying alpha from N-body Simulations

- Physics
- 2010

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 which… Expand

Non-linear structure formation in the ‘Running FLRW’ cosmological model

- Physics
- 2016

We present a suite of cosmological N-body simulations describing the \Running Friedmann-Lematre-Robertson-Walker" (R-FLRW) cosmological model. This model is based on quantum eld theory in a curved… Expand

Halo modelling in chameleon theories

- Physics
- 2014

We analyse modelling techniques for the large-scale structure formed in scalar-tensor theories of constant Brans-Dicke parameter which match the concordance model background expansion history and… Expand

Hydrodynamical simulations of galaxy clusters in dark energy cosmologies – I. General properties

- Physics
- 2010

We investigate the influence of dark energy on structure form ation, within five different cos- mological models, namely a concordanceCDM model, two models with dynamical dark en- ergy, viewed as a… Expand

On the Effects of Coupled Scalar Fields on Structure Formation

- Physics
- 2010

A coupling between a scalar field (representing the dark energy) and dark matter could produce rich phenomena in cosmology. It affects cosmic structure formation mainly through the fifth force, a… Expand

Hydrodynamic effects in the symmetron and f(R)-gravity models

- Physics
- 2015

In this paper we present the first results from implementing two scalar-tensor modified gravity theories, the symmetron and the Hu-Sawicki $f(R)$-gravity model, into a hydrodynamic N-body code with… Expand

Cosmological simulations with hydrodynamics of screened scalar-tensor gravity with non-universal coupling

- Physics
- 2015

In this paper we study the effects of letting the dark matter and the gas in the Universe couple to the scalar field of the symmetron model, a modified gravity theory, with varying coupling strength.… Expand

ISIS: a new N-body cosmological code with scalar fields based on RAMSES

- Physics
- 2013

Several extensions of the standard cosmological model include scalar fields as new degrees of freedom in the underlying gravitational theory. A particular class of these scalar field theories include… Expand

Modified gravity N-body code comparison project

- Physics
- 2015

Self-consistent N-body simulations of modified gravity models are a key ingredient to obtain rigorous constraints on deviations from general relativity using large-scale structure observations. This… Expand

#### References

SHOWING 1-10 OF 78 REFERENCES

N-Body Simulations for Coupled Scalar Field Cosmology

- Physics
- 2011

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 of… Expand

STRUCTURE FORMATION BY FIFTH FORCE: POWER SPECTRUM FROM N-BODY SIMULATIONS

- Physics
- 2010

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 dynamical… Expand

Self-Consistent Cosmological Simulations of DGP Braneworld Gravity

- Physics
- 2009

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, the… Expand

Varying alpha from N-body Simulations

- Physics
- 2010

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 which… Expand

Growth of perturbations in dark matter coupled with quintessence

- Physics
- 2005

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 such… Expand

Non-linear evolution of f(R) cosmologies I: methodology

- Physics
- 2008

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 and… Expand

Nonlinear matter spectra in coupled quintessence

- Physics
- 2010

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-group… Expand

Perturbation evolution with a nonminimally coupled scalar field

- Physics
- 2001

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 be… Expand

Coupled dark energy: Parameter constraints from N-body simulations

- Physics
- 2004

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 coupling… Expand

Scalar tensor gravity and quintessence

- Physics
- 1999

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 to… Expand