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DGP specteroscopy
2006
Journal of High Energy Physics
We systematically explore the spectrum of gravitational perturbations in codimension-1 DGP braneworlds, and find a 4D ghost on the self-accelerating branch of solutions. The ghost appears for any value of the brane tension, although depending on the sign of the tension it is either the helicity-0 component of the lightest localized massive tensor of mass 0<m^2 < 2H^2 for positive tension, the scalar 'radion' for negative tension, or their admixture for vanishing tension. Because the ghost is
doi:10.1088/1126-6708/2006/10/066
fatcat:amzlhasl3fgf5p23k4e33ekdy4