Phys. Rev. D 74, 063518 (2006) [12 pages]The null energy condition and instabilityReceived 16 June 2006; published 21 September 2006 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=p/ρ is unlikely to be less than -1. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.74.063518
DOI:
10.1103/PhysRevD.74.063518
PACS:
98.80.Cq
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