Ghost-free braneworld bigravity

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.

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

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Cited by in corpus (34)

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• Late acceleration and $w=-1$ crossing in induced gravity
• Multi-galileons, solitons and Derrick's theorem
• Bi-galileon theory II: phenomenology
• Cosmic acceleration from asymmetric branes
• Brane-bulk energy exchange : a model with the present universe as a global attractor
• Infra-red modification of gravity from asymmetric branes
• Gravitational waves from brane-world inflation with induced gravity
• Cosmic Mimicry: Is LCDM a Braneworld in Disguise ?
• Mapping de Rham-Gabadadze-Tolley bigravity into braneworld setup
• Constraining cosmological extra dimensions with gravitational wave standard sirens: from theory to current and future multi-messenger observations
• Stealth Acceleration and Modified Gravity
• Aspects of Infrared Modifications of Gravity
• The Interval Approach to Braneworld Gravity
• Revamped Braneworld Gravity
• Linearized gravity on the Randall-Sundrum two-brane background with curvature terms in the action for the branes
• Weakly-coupled metastable graviton
• Testing the nature of gravitational wave propagation using dark sirens and galaxy catalogues
• Brane induced gravity in warped backgrounds and the absence of the radion
• Quasilocalized gravity without asymptotic flatness
• On Instability of Certain Bi-Metric and Massive-Gravity Theories
• Modified Large Distance Newton Potential on a Gauss-Bonnet Brane World
• Chiral gravity as a covariant formulation of massive gravity
• Localized gravity in non-compact superstring models
• Bulk scalar field in brane-worlds with induced gravity inspired by the $\mathcal{L}(R)$ term
• Modification of the laws of gravity in the DGP model by the presence of a second DGP brane
• DGP with bubble of nothing
• Mirror branes
• On the long-range gravity in warped backgrounds
• Bigravity from gradient expansion