Null Energy Condition violations in bimetric gravity
General Relativity and Quantum Cosmology
2012-12-06 v2 High Energy Physics - Theory
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.
Cite
@article{arxiv.1206.3814,
title = {Null Energy Condition violations in bimetric gravity},
author = {Valentina Baccetti and Prado Martin-Moruno and Matt Visser},
journal= {arXiv preprint arXiv:1206.3814},
year = {2012}
}
Comments
v1: 16 pages; v2: 2 references added