2000 character limit reached
Polycritical Gravities
Published 23 Mar 2012 in hep-th | (1203.5338v2)
Abstract: We present higher-derivative gravities that propagate an arbitrary number of gravitons of different mass on (A)dS 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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