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}
}
  • Antonio Padilla
  • Published 10 February 2004
  • Physics, Geology
  • Classical and Quantum Gravity
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. 

Figures from this paper

Mapping the ghost free bigravity into braneworld setup

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

4D Gravity on a Brane in 5D Minkowski Space

Linearized gravity in brane backgrounds

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
...