Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.111301
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Funding
- U. S. DOE [DE-FG02-94ER-40823]
- Science and Technology Facilities Council [ST/G000743/1] Funding Source: researchfish
- STFC [ST/G000743/1] Funding Source: UKRI
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Models with vector fields acquiring a nonvanishing vacuum expectation value along one spatial direction have been proposed to sustain a prolonged stage of anisotropic accelerated expansion. Such models have been used for realizations of early time inflation, with a possible relation to the large scale cosmic microwave background anomalies, or of the late time dark energy. We show that, quite generally, the concrete realizations proposed so far are plagued by instabilities (either ghosts or unstable growth of the linearized perturbations) which can be ultimately related to the longitudinal vector polarization present in them. Phenomenological results based on these models are therefore unreliable.
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