In a two-brane DGP model, the gravitational potential between sources on different branes is controlled by a new scale ρ=√(rc R), producing weaker-than-5D gravity and a distance-independent force for R≪r≪ρ.
Ghost-free braneworld bigravity
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abstract
We consider a generalisation of the DGP model, by adding a second brane with localised 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.
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Modification of the laws of gravity in the DGP model by the presence of a second DGP brane
In a two-brane DGP model, the gravitational potential between sources on different branes is controlled by a new scale ρ=√(rc R), producing weaker-than-5D gravity and a distance-independent force for R≪r≪ρ.