# Ghost-free braneworld bigravity

@article{Padilla2004GhostfreeBB, title={Ghost-free braneworld bigravity}, author={Antonio Padilla}, journal={Classical and Quantum Gravity}, year={2004}, volume={21}, pages={2899-2917} }

We consider a generalization of the DGP model, by adding a second brane with localized curvature, and allowing for a bulk cosmological constant and brane tensions. We study radion and graviton fluctuations in detail, enabling us to check for ghosts and tachyons. By tuning our parameters accordingly, we find bigravity models that are free from ghosts and tachyons. These models will lead to large distance modifications of gravity that could be observable in the near future.

## 30 Citations

### Mapping the ghost free bigravity into braneworld setup

- Physics
- 2014

We discuss whether or not bigravity theory can be embedded into the braneworld setup. As a candidate, we consider Dvali-Gabadadze-Porrati two-brane model with the Goldberger-Wise radion…

### Bigravity from gradient expansion

- Physics
- 2015

We discuss how the ghost-free bigravity coupled with a single scalar field can be derived from a braneworld setup. We consider DGP two-brane model without radion stabilization. The bulk configuration…

### Localized gravity in non-compact superstring models

- Physics
- 2003

We discuss a string-theory-derived mechanism for localized gravity, which produces a deviation from Newton's law of gravitation at cosmological distances. This mechanism can be realized for general…

### Bulk scalar field in brane-worlds with induced gravity inspired by the ℒ(R) term

- Physics
- 2009

We obtain the effective field equations in a brane-world scenario within the framework of a DGP model where the action on the brane is an arbitrary function of the Ricci scalar, (R), and the bulk…

### Infra-red modification of gravity from asymmetric branes

- Physics
- 2005

We consider a single Minkowski brane sandwiched in between two copies of anti-de Sitter space. We allow the bulk Planck mass and cosmological constant to differ on either side of the brane.…

### Revamped Braneworld Gravity

- Physics
- 2006

Gravity in five-dimensional braneworld backgrounds often exhibits problematic features, including kinetic ghosts, strong coupling, and the vDVZ discontinuity. These problems are an obstacle to…

### Cosmic acceleration from asymmetric branes

- Physics
- 2005

We consider a single 3-brane sitting in between two different five-dimensional spacetimes. On each side of the brane, the bulk is a solution to Gauss–Bonnet gravity, although the bare cosmological…

### Tensorial perturbations in a brane with induced gravity

- Physics
- 2006

We calculate the amplitude of gravitational waves produced by inflation on a de Sitter brane embedded in five-dimensional anti-de Sitter bulk space-time, extending previous calculations in…

## References

SHOWING 1-10 OF 69 REFERENCES

### Inflation and gauge hierarchy in Randall-Sundrum compactification

- Physics
- 2000

We obtain the general inflationary solutions for the slab of five-dimensional AdS spacetime where the fifth dimension is an orbifold $S^1/Z_2$ and two three-branes reside at its boundaries, of which…

### Braneworld Instantons

- Physics
- 2001

We derive the general equations of motion for a braneworld containing a (localized) domain wall. Euclideanization gives the geometry for braneworld false vacuum decay. We explicitly derive these…

### Braneworld holography in Gauss-Bonnet gravity

- Physics
- 2003

We investigate holography on an (n − 1)>-dimensional brane embedded in a background of AdS black holes, in n-dimensional Gauss–Bonnet gravity. We demonstrate that for a critical brane near the AdS…

### MULTI-GRAVITON THEORY FROM A DISCRETIZED RS BRANE-WORLD AND THE INDUCED COSMOLOGICAL CONSTANT

- Physics
- 2003

We propose a multi-graviton theory with non-nearest-neighbor couplings in the theory space. The resulting four-dimensional discrete mass spectrum reflects the structure of a latticed extra dimension.…

### Multigravity in six dimensions: Generating bounces with flat positive tension branes

- Physics
- 2001

We present a generalization of the five dimensional multigravity models to six dimensions. The key characteristic of these constructions is that that we obtain solutions which do not have any…

### Locally localized gravity

- Physics
- 2000

We study the fluctuation spectrum of linearized gravity around non-fine-tuned branes. We focus on the case of an AdS4 brane in AdS§. In this case, for small cosmological constant, the warp factor…

### Wave function of the radion in a brane world

- Physics
- 2000

We calculate the linearized metric perturbation corresponding to a massless four-dimensional scalar field, the radion, in a five-dimensional two-brane model of Randall and Sundrum. In this way we…

### Linearized gravity in brane backgrounds

- Physics
- 2000

A treatment of linearized gravity is given in the Randall-Sundrum background. The graviton propagator is found in terms of the scalar propagator, for which an explicit integral expression is…