Antisymmetric-Tensor and Electromagnetic effects in an alpha'-non-perturbative Four-Dimensional String Cosmology

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dc.creatorAlexandre, Jean
dc.creatorMavromatos, Nick E.
dc.creatorTanner, Dylan
dc.date2007-08-08
dc.date.accessioned2026-07-07T11:18:33Z
dc.date.available2026-07-07T11:18:33Z
dc.descriptionStarting from an exact (in the Regge slope alpha') functional method for a bosonic stringy sigma-model, we investigate four-dimensional cosmological string solutions in graviton, dilaton and antisymmetric tensor backgrounds, compatible with world-sheet conformal invariance, and valid beyond perturbative expansions in powers of alpha'. The antisymmetric tensor field, playing the role of an axion in the four-dimensional target space time, leads to spatial anisotropies of the emergent Robertson-Walker expanding Universe, and, upon coupling the system to the electromagnetic field, it results in non-trivial optical activity. Some estimates of the corresponding effects are made and their relevance to current cosmology is briefly discussed.
dc.identifierhttps://arxiv.org/abs/0708.1154
dc.identifierhttp://arxiv.org/abs/0708.1154
dc.identifierNewJ.Phys.10:033033,2008
dc.identifierdoi:10.1088/1367-2630/10/3/033033
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193381
dc.subjectHigh Energy Physics - Theory
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAntisymmetric-Tensor and Electromagnetic effects in an alpha'-non-perturbative Four-Dimensional String Cosmology
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