Choosing the Lorentz-violating tensor with spatial components Bii = -3B00 makes the quadratic kinetic term Lorentz invariant, giving the phantom excitation the dispersion omega^2 = k^2 for any background.
The role of potential in the ghost-condensate dark energy model
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We consider the ghost-condensate model of dark energy with a generic potential term. The inclusion of the potential is shown to give greater freedom in realising the phantom regime. The self-consistency of the analysis is demonstrated using WMAP7+BAO+Hubble data.
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Restoration of the Lorentz symmetry of particle propagator in the ghost condensate model
Choosing the Lorentz-violating tensor with spatial components Bii = -3B00 makes the quadratic kinetic term Lorentz invariant, giving the phantom excitation the dispersion omega^2 = k^2 for any background.