# Galileon Cosmology

@inproceedings{Chow2009GalileonC, title={Galileon Cosmology}, author={Nathan Chow and Justin Khoury}, year={2009} }

We study the cosmology of a galileon scalar-tensor theory, obtained by covariantizing the decoupling lagrangian of the Dvali-Gabadadze-Poratti (DGP) model. Despite being local in 3+1 dimensions, the resulting cosmological evolution is remarkably similar to that of the full 4+1-dimensional DGP framework, both for the expansion history and the evolution of density perturbations. As in the DGP model, the covariant galileon theory yields two branches of solutions, depending on the sign of the…

## 247 Citations

### Symmetron Cosmology

- Physics
- 2011

The symmetron is a scalar field associated with the dark sector whose coupling to matter depends on the ambient matter density. The symmetron is decoupled and screened in regions of high density,…

### Galileon gravity in light of ISW, CMB, BAO and H0 data

- Physics
- 2017

Cosmological models with Galileon gravity are an alternative to the standard ΛCDM paradigm with testable predictions at the level of its self-accelerating solutions for the expansion history, as well…

### Light mass galileons: Cosmological dynamics, mass screening and observational constraints

- Physics
- 2012

### Primordial fluctuations and non-Gaussianities from multifield DBI Galileon inflation

- Physics
- 2011

We study a cosmological scenario in which the DBI action governing the motion of a D3-brane in a higher-dimensional spacetime is supplemented with an induced gravity term. The latter reduces to the…

### Bouncing Galileon cosmologies

- Physics
- 2011

We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal Galileon model. We show that such solutions necessarily begin with a radiation-dominated contracting phase. This…

### Bouncing Galileon cosmologies

- Physics
- 2011

We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal Galileon model. We show that such solutions necessarily begin with a radiation-dominated contracting phase. This…

### Cosmological constraints on extended Galileon models

- Physics
- 2012

The extended Galileon models possess tracker solutions with de Sitter attractors along which the dark energy equation of state is constant during the matter-dominated epoch, i.e. wDE = −1−s, where s…

### Cosmological constraints on extended Galileon models

- Physics
- 2012

The extended Galileon models possess tracker solutions with de Sitter attractors along which the dark energy equation of state is constant during the matter-dominated epoch, i.e. wDE = −1−s, where s…

### Cosmology in generalized Proca theories

- Physics, Mathematics
- 2016

We consider a massive vector field with derivative interactions that propagates only the 3 desired polarizations (besides two tensor polarizations from gravity) with second-order equations of motion…

### Cosmological tests of coupled Galileons

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2015

We investigate the cosmological properties of Galileon models which admit Minkowski space as a stable solution in vacuum. This is motivated by stable, positive tension brane world constructions that…

## References

SHOWING 1-10 OF 149 REFERENCES

### Galileon as a local modification of gravity

- Physics
- 2009

In the Dvali-Gabadadze-Porrati (DGP) model, the "self-accelerating" solution is plagued by a ghost instability, which makes the solution untenable. This fact, as well as all interesting departures…

### 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…

### 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…

### On the Initial Conditions in New Ekpyrotic Cosmology

- Physics
- 2007

New Ekpyrotic Cosmology is an alternative scenario of early universe cosmology in which the universe existed before the big bang. The simplest model relies on two scalar fields, whose entropy…

### New Ekpyrotic Cosmology

- Physics
- 2007

In this paper, we present a new scenario of the early universe that contains a pre-big bang ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the null energy…

### 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…

### Cascading gravity and degravitation

- Physics
- 2008

We construct a cascading brane model of gravity in which the behavior of the gravitational force law interpolates from (n+4)-dimensional to (n+3)-dimensional all the way down to 4-dimensional from…

### 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,…

### Cascading gravity: extending the Dvali-Gabadadze-Porrati model to higher dimension.

- PhysicsPhysical review letters
- 2008

We present a generalization of the Dvali-Gabadadze-Porrati scenario to higher codimensions which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by…