TY - JOUR
T1 - Null energy condition violations in bimetric gravity
AU - Baccetti, Valentina
AU - Martin-Moruno, Prado
AU - Visser, Matt
PY - 2012/8/29
Y1 - 2012/8/29
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84865783185&partnerID=8YFLogxK
U2 - 10.1007/JHEP08(2012)148
DO - 10.1007/JHEP08(2012)148
M3 - Article
AN - SCOPUS:84865783185
SN - 1126-6708
SP - 1
EP - 13
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 8
M1 - 148
ER -