Instability of anisotropic cosmological solutions supported by vector fields

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dc.creatorHimmetoglu, Burak
dc.creatorContaldi, Carlo R.
dc.creatorPeloso, Marco
dc.date2008-09-17
dc.date.accessioned2026-07-07T13:01:01Z
dc.date.available2026-07-07T13:01:01Z
dc.descriptionModels 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.
dc.identifierhttps://arxiv.org/abs/0809.2779
dc.identifierhttp://arxiv.org/abs/0809.2779
dc.identifierPhys.Rev.Lett.102:111301,2009
dc.identifierdoi:10.1103/PhysRevLett.102.111301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226027
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleInstability of anisotropic cosmological solutions supported by vector fields
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