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Ghosts in asymmetric brane gravity and the decoupled stealth limit

Koyama, K; Padilla, A; Silva, FP; (2009) Ghosts in asymmetric brane gravity and the decoupled stealth limit. Journal of High Energy Physics , 2009 (3) 10.1088/1126-6708/2009/03/134.

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Abstract

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. © SISSA 2009.

Type: Article
Title: Ghosts in asymmetric brane gravity and the decoupled stealth limit
DOI: 10.1088/1126-6708/2009/03/134
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology > Institute of Archaeology Gordon Square
URI: http://discovery.ucl.ac.uk/id/eprint/1346064
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