Abstract
We consider the effective stress-energy tensors for the foreground and background sectors in ghost-free bimetric gravity. By considering the symmetries of the theory, we show that the foreground and background null energy conditions (NECs) are strongly anti-correlated. In particular, the NECs can only be simultaneously fulfilled when they saturate, corresponding to foreground and background cosmological constants. In all other situations, either the foreground or the background is subject to a NEC-violating contribution to the total stress-energy.
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ArXiv ePrint: 1206.3814
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Baccetti, V., Martin-Moruno, P. & Visser, M. Null Energy Condition violations in bimetric gravity. J. High Energ. Phys. 2012, 148 (2012). https://doi.org/10.1007/JHEP08(2012)148
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DOI: https://doi.org/10.1007/JHEP08(2012)148