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Gradient instability for w < -1
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abstract
We show that in single scalar field models of the dark energy with equations of state satisfying $w \equiv p / \rho < -1$, the effective Lagrangian for fluctuations about the homogeneous background has a wrong sign spatial kinetic term. In most cases, spatial gradients are ruled out by microwave background observations. The sign of $w+1$ is not connected to the sign of the time derivative kinetic term in the effective Lagrangian.
Forward citations
Cited by 4 Pith papers
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