Null energy condition violations in bimetric gravity

Valentina Baccetti*, Prado Martin-Moruno, Matt Visser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


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.

Original languageEnglish
Article number148
Pages (from-to)1-13
Number of pages13
JournalJournal of High Energy Physics
Issue number8
Publication statusPublished - 29 Aug 2012
Externally publishedYes


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