Abstract
In this paper we provide a short review of the main results developed in Charmousis et al (2006 Preprint hep-th/0604086). We focus on linearized vacuum perturbations about the self-accelerating branch of solutions in the DGP model. These are shown to contain a ghost in the spectrum for any value of the brane tension. We also comment on Deffayet et al (2006 Preprint hep-th/0607099), where some counter arguments have been presented.
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