Ghosts in asymmetric brane gravity and the decoupled stealth limit

Details Ghosts in asymmetric brane gravity and the decoupled stealth limit Ghosts in asymmetric brane gravity and the decoupled stealth limit

2009-01-06

arxiv.org/abs/0901.0713v1

JHEP 0903:134,2009

Physics

High Energy Physics

High Energy Physics - Theory

21 pages

Scientific paper

10.1088/1126-6708/2009/03/134

We study the spectrum of gravitational perturbations around a vacuum de Sitter brane in a 5D asymmetric braneworld model, with induced curvature on the brane. This generalises the stealth acceleration model proposed by Charmousis, Gregory and Padilla (CGP) which realises the Cardassian cosmology in which power law cosmic acceleration can be driven by ordinary matter. Whenever the bulk has infinite volume we find that there is always a perturbative ghost propagating on the de Sitter brane, in contrast to the Minkowski brane case analysed by CGP. We discuss the implication of this ghost for the stealth acceleration model, and identify a limiting case where the ghost decouples as the de Sitter curvature vanishes.

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