Ghost-free braneworld bigravity
High Energy Physics - Theory
2009-11-10 v3 Astrophysics
High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.hep-th/0402079,
title = {Ghost-free braneworld bigravity},
author = {Antonio Padilla},
journal= {arXiv preprint arXiv:hep-th/0402079},
year = {2009}
}
Comments
Dedicated to the memory of Ian Kogan. Version to appear in Classical and Quantum Gravity