The null energy condition and instability

Details The null energy condition and instability The null energy condition and instability

2006-06-09

arxiv.org/abs/hep-th/0606091v1

Phys.Rev.D74:063518,2006

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 5 figures, Revtex

Scientific paper

10.1103/PhysRevD.74.063518

We extend previous work showing that violation of the null energy condition implies instability in a broad class of models, including gauge theories with scalar and fermionic matter as well as any perfect fluid. Simple examples are given to illustrate these results. The role of causality in our results is discussed. Finally, we extend the fluid results to more general systems in thermal equilibrium. When applied to the dark energy, our results imply that w is unlikely to be less than -1.

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