Cosmic electromagnetic fields due to perturbations in the gravitational field

Simple item page
dc.contributor.authorMongwane, Bishopen_ZA
dc.contributor.authorDunsby, Peter K Sen_ZA
dc.contributor.authorOsano, Otieno Boben_ZA
dc.date.accessioned2014-10-28T14:02:16Z
dc.date.available2014-10-28T14:02:16Z
dc.date.issued2012en_ZA
dc.descriptionThe is a copy of an article published by American Physical Society: Mongwane, B., Dunsby, P. K. S., Osano, O. B. 2012. Cosmic electromagnetic fields due to perturbations in the gravitational field. Physical Review D. DOI: 10.1103/PhysRevD.86.083533.en_ZA
dc.description.abstractWe use non-linear gauge-invariant perturbation theory to study the interaction of an inflation produced seed magnetic field with density and gravitational wave perturbations in an almost Friedmann-Lemaˆıtre-Robertson-Walker (FLRW) spacetime with zero spatial curvature. We compare the effects of this coupling under the assumptions of poor conductivity, perfect conductivity and the case where the electric field is sourced via the coupling of velocity perturbations to the seed field in the ideal magnetohydrodynamic (MHD) regime, thus generalizing, improving on and correcting previous results. We solve our equations for long wavelength limits and numerically integrate the resulting equations to generate power spectra for the electromagnetic field variables, showing where the modes cross the horizon. We find that the interaction can seed Electric fields with non-zero curl and that the curl of the electric field dominates the power spectrum on small scales, in agreement with previous arguments.en_ZA
dc.identifier.apacitationMongwane, B., Dunsby, P. K. S., & Osano, O. B. (2012). Cosmic electromagnetic fields due to perturbations in the gravitational field. <i>Physical Review D</i>, http://hdl.handle.net/11427/8843en_ZA
dc.identifier.chicagocitationMongwane, Bishop, Peter K S Dunsby, and Otieno Bob Osano "Cosmic electromagnetic fields due to perturbations in the gravitational field." <i>Physical Review D</i> (2012) http://hdl.handle.net/11427/8843en_ZA
dc.identifier.citationMongwane, B., Dunsby, P., Osano, O. 2012. Cosmic electromagnetic fields due to perturbations in the gravitational field. Physical Review D.en_ZA
dc.identifier.issn1550-7998en_ZA
dc.identifier.ris TY - Journal Article AU - Mongwane, Bishop AU - Dunsby, Peter K S AU - Osano, Otieno Bob AB - We use non-linear gauge-invariant perturbation theory to study the interaction of an inflation produced seed magnetic field with density and gravitational wave perturbations in an almost Friedmann-Lemaˆıtre-Robertson-Walker (FLRW) spacetime with zero spatial curvature. We compare the effects of this coupling under the assumptions of poor conductivity, perfect conductivity and the case where the electric field is sourced via the coupling of velocity perturbations to the seed field in the ideal magnetohydrodynamic (MHD) regime, thus generalizing, improving on and correcting previous results. We solve our equations for long wavelength limits and numerically integrate the resulting equations to generate power spectra for the electromagnetic field variables, showing where the modes cross the horizon. We find that the interaction can seed Electric fields with non-zero curl and that the curl of the electric field dominates the power spectrum on small scales, in agreement with previous arguments. DA - 2012 DB - OpenUCT DP - University of Cape Town J1 - Physical Review D LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 SM - 1550-7998 T1 - Cosmic electromagnetic fields due to perturbations in the gravitational field TI - Cosmic electromagnetic fields due to perturbations in the gravitational field UR - http://hdl.handle.net/11427/8843 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8843
dc.identifier.vancouvercitationMongwane B, Dunsby PKS, Osano OB. Cosmic electromagnetic fields due to perturbations in the gravitational field. Physical Review D. 2012; http://hdl.handle.net/11427/8843.en_ZA
dc.language.isoengen_ZA
dc.publisherAmerican Physical Societyen_ZA
dc.publisher.departmentAcademic Development Programme (ADP)en_ZA
dc.publisher.facultyCentre for Higher Education Developmenten_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourcePhysical Review Den_ZA
dc.source.urihttp://dx.doi.org/10.1103/PhysRevD.86.083533en_ZA
dc.titleCosmic electromagnetic fields due to perturbations in the gravitational fielden_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
CHED_artile_electromagneticfields_Mongwane_2012.pdf
Size:
268.12 KB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Journal Articles