# Structure formation in modified gravity models

@article{Koyama2006StructureFI, title={Structure formation in modified gravity models}, author={Kazuya Koyama}, journal={Journal of Cosmology and Astroparticle Physics}, year={2006}, volume={2006}, pages={017 - 017} }

We study structure formation in phenomenological models in which the Friedmann equation receives a correction of the form Hα/rc2 − α, to realize an accelerated expansion without dark energy. In order to address structure formation in these models, we construct simple covariant gravitational equations which give the modified Friedmann equation with α = 2/n, where n is an integer. For n = 2, the underlying theory is known as a five-dimensional (5D) braneworld model (the DGP model). Thus the…

## 44 Citations

### Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity

- Physics
- 2009

We present a formalism to calculate the nonlinear matter power spectrum in modified gravity models that explain the late-time acceleration of the Universe without dark energy. Any successful modified…

### Large scale structures in the kinetic gravity braiding model that can be unbraided

- Physics
- 2011

We study cosmological consequences of a kinetic gravity braiding model, which is proposed as an alternative to the dark energy model. The kinetic braiding model we study is characterized by a…

### Spherical collapse in modified gravity with the Birkhoff theorem

- Physics
- 2007

We study structure formation in a phenomenological model of modified gravity which interpolates between Acold dark mtter (ACDM) and Dvali-Gabadadze-Porrati (DGP) gravity. In our model, the Friedmann…

### New measures to test modified gravity cosmologies

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

The observed accelerated expansion of the Universe may be explained by dark energy or the breakdown of general relativity (GR) on cosmological scales. When the latter case, a modified gravity…

### The cosmological constant and dark energy in braneworlds

- Physics
- 2007

We review recent attempts to address the cosmological constant problem and the late-time acceleration of the Universe based on braneworld models. In braneworld models, the way in which the vacuum…

### Consistency test of general relativity from large scale structure of the universe

- Physics
- 2009

We construct a consistency test of General Relativity (GR) on cosmological scales. This test enables us to distinguish between the two alternatives to explain the late-time accelerated expansion of…

### Testing a phenomenologically extended DGP model with upcoming weak lensing surveys

- Physics
- 2011

A phenomenological extension of the well-known brane-world cosmology of Dvali, Gabadadze and Porrati (eDGP) has recently been proposed. In this model, a cosmological-constant-like term is explicitly…

### Towards precision constraints on gravity with the Effective Field Theory of Large-Scale Structure

- Physics
- 2018

We compare analytical computations with numerical simulations for dark-matter clustering, in general relativity and in the normal branch of DGP gravity (nDGP). Our analytical frameword is the…

### N-body simulations of alternative gravity models

- Physics
- 2006

Theories in which gravity is weaker on cosmological scales have been proposed to explain the observed acceleration of the universe. The nonlinear regime in such theories is not well studied, though…

### Exponential Potentials and Attractor Solution of Dilatonic Cosmology

- Physics
- 2007

Abstract
We present the scalar-tensor gravitational theory with an exponential potential in which Pauli metric is regarded as the physical space-time metric. We show that it is essentially equivalent…

## References

SHOWING 1-10 OF 25 REFERENCES

### Structure formation in the Dvali–Gabadadze–Porrati cosmological model

- Physics
- 2005

The DGP brane-world model provides an alternative to the standard LCDM cosmology, in which the late universe accelerates due to a modification of gravity rather than vacuum energy. The cosmological…

### Ghosts in the self-accelerating brane universe

- Physics
- 2005

We study the spectrum of gravitational perturbations about a vacuum de Sitter brane with the induced 4D Einstein-Hilbert term, in a 5D Minkowski spacetime (DGP model). We consider solutions that…

### The Einstein Equations on the 3-BRANE World:. a Window to Extra Dimensions

- Physics
- 2000

We carefully investigate the gravitational equations of the brane world, in which all the matter forces except gravity are confined on the 3-brane in a 5-dimensional spacetime with $Z_2$ symmetry. We…

### Weak gravity in the Dvali-Gabadadze-Porrati braneworld model

- Physics
- 2004

We analyze the weak gravity in the braneworld model proposed by Dvali-Gabadadze-Porrati, in which the unperturbed background spacetime is given by five dimensional Minkowski bulk with a brane which…

### Strong Interactions and Stability in the DGP Model

- Physics
- 2003

The model of Dvali, Gabadadze, and Porrati (DGP) gives a simple geometrical setup in which gravity becomes 5-dimensional at distances larger than a length scale lambda(DGP). We show that this theory…

### Nonperturbative Continuity in Graviton Mass versus Perturbative Discontinuity

- Physics
- 2002

We address the question whether a graviton could have a small nonzero mass. The issue is subtle for two reasons: there is a discontinuity in the mass in the lowest tree-level approximation, and,…

### Cardassian expansion: a model in which the universe is flat, matter dominated, and accelerating

- Physics
- 2002

### Classical and Quantum Consistency of the DGP Model

- Physics
- 2004

We study the Dvali-Gabadadze-Porrati model by the method of the boundary effective action. The truncation of this action to the bending mode π consistently describes physics in a wide range of…