Instabilities and the null energy condition

Details Instabilities and the null energy condition Instabilities and the null energy condition

2005-02-22

arxiv.org/abs/hep-th/0502203v3

Phys.Lett. B632 (2006) 543-546

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, 1 figure, revtex, presentation improved, minor changes

Scientific paper

10.1016/j.physletb.2005.10.075

We show that violation of the null energy condition implies instability in a
broad class of models, including classical gauge theories with scalar and
fermionic matter as well as any perfect fluid. When applied to the dark energy,
our results imply that $w = p / \rho$ is unlikely to be less than -1.

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