Instabilities and the null energy condition

Abstract

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.

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

References in corpus (4)

• Can dark energy evolve to the Phantom?
• Quantum effects can render w<-1 on cosmological scales
• Perfect Fluid Theory and its Extensions
• Gradient instability for w < -1

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