Ghost-free braneworld bigravity

2004/02/29 by Antonio Padilla · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1088/0264-9381/21/12/008

published as Class.Quant.Grav. 21 (2004) 2899-2918 · Dedicated to the memory of Ian Kogan. Version to appear in Classical and Quantum Gravity

arxiv created 2004/05/10 · openalex publication_date 2004/05/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• Multi(Scale)Gravity: A Telescope for the Micro-World
• Large Mass Hierarchy from a Small Extra Dimension
• On relativistic wave equations for particles of arbitrary spin in an electromagnetic field
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Massive and mass-less Yang-Mills and gravitational fields

Cited by

• Bulk scalar field in brane-worlds with induced gravity inspired by the ℒ(R) term
• Cosmic acceleration from asymmetric branes