Journal
PHYSICAL REVIEW D
Volume 85, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.124040
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We present higher-derivative gravities that propagate an arbitrary number of gravitons of different mass on (anti-) de Sitter backgrounds. These theories have multiple critical points, at which the masses degenerate and the graviton energies are non-negative. For six derivatives and higher there are critical points with positive energy.
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