Journal
PHYSICS LETTERS B
Volume 632, Issue 4, Pages 543-546Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2005.10.075
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We show 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. When applied to the dark energy, our results imply that w = p/rho is unlikely to be less than -1. (c) 2005 Elsevier B.V. All rights reserved.
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