Ghost-free braneworld bigravity

Details Ghost-free braneworld bigravity Ghost-free braneworld bigravity

2004-02-10

arxiv.org/abs/hep-th/0402079v3

Class.Quant.Grav. 21 (2004) 2899-2918

Physics

High Energy Physics

High Energy Physics - Theory

Dedicated to the memory of Ian Kogan. Version to appear in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/21/12/008

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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