Tuesday, November 27, 2012

1211.6001 (Clare Burrage et al.)

Strong Coupling and Bounds on the Graviton Mass in Massive Gravity    [PDF]

Clare Burrage, Nemanja Kaloper, Antonio Padilla
The theory of a single massive graviton has a cutoff much below its Planck scale, because the extra modes from the graviton multiplet involve higher derivative self-interactions, controlled by a scale convoluted from the small graviton mass. On a generic background, these correct the propagator by environmental effects. The resulting effective cutoff depends on the environmental parameters and the graviton mass. Requiring the theory to be perturbative down to O(1) mm, we derive bounds on the graviton mass, corresponding to scales greater than or similar to O(1) meV for the generic case, and somewhat weaker bounds in cases of fine-tuning. In all cases the mass is required to be much too large for the theory to conform with GR at cosmological distances. Similar results are also found in quartic and quintic Galileon theory.
View original: http://arxiv.org/abs/1211.6001

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