Null Energy Condition violations in bimetric gravity

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.

v1: 16 pages; v2: 2 references added

References in corpus (4)

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• Interacting Spin-2 Fields
• Worse than a big rip?
• On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?

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