Instability of anisotropic cosmological solutions supported by vector fields

Details Instability of anisotropic cosmological solutions supported by vector fields Instability of anisotropic cosmological solutions supported by vector fields

2008-09-17

arxiv.org/abs/0809.2779v1

Phys.Rev.Lett.102:111301,2009

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1103/PhysRevLett.102.111301

Models with vector fields acquiring a non-vanishing 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 CMB 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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