Instability of anisotropic cosmological solutions supported by vector fields

Burak Himmetoglu, Carlo R. Contaldi, Marco Peloso

Research output: Contribution to journalArticlepeer-review

177 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number111301
JournalPhysical Review Letters
Volume102
Issue number11
DOIs
StatePublished - Mar 17 2009

Fingerprint Dive into the research topics of 'Instability of anisotropic cosmological solutions supported by vector fields'. Together they form a unique fingerprint.

Cite this