The dark magnetism of the Universe

Despite the success of Maxwell's electromagnetism in the description of the electromagnetic on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that the problems of dark energy and the origin of cosmic...

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Detalles Bibliográficos
Autores: López Maroto, Antonio, Beltrán Jiménez, José
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44252
Acceso en línea:https://hdl.handle.net/20.500.14352/44252
Access Level:acceso abierto
Palabra clave:53
Fields
Energy
Photon
Origin
Ghost
Física (Física)
22 Física
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oai_identifier_str oai:docta.ucm.es:20.500.14352/44252
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repository_id_str
spelling The dark magnetism of the UniverseLópez Maroto, AntonioBeltrán Jiménez, José53FieldsEnergyPhotonOriginGhostFísica (Física)22 FísicaDespite the success of Maxwell's electromagnetism in the description of the electromagnetic on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that the problems of dark energy and the origin of cosmic magnetic fields could be pointing to a modification of Maxwell's theory on large scales. Here, we review such a proposal in which the scalar state which is usually eliminated by means of the Lorenz condition is allowed to propagate. On super-Hubble scales, the new mode is essentially given by the temporal component of the electromagnetic potential and contributes as an effective cosmological constant to the energy-momentum tensor. The new state can be generated from quantum fluctuations during inflation and it is shown that the predicted value for the cosmological constant agrees with observations, provided inflation took place at the electroweak scale. We also consider more general theories including non-minimal couplings to the spacetime curvature in the presence of the temporal electromagnetic background. We show that both in the minimal and non-minimal cases, the modified Maxwell's equations include new effective current terms which can generate magnetic fields from sub-galactic scales up to the present Hubble horizon. The corresponding amplitudes could be enough to seed a galactic dynamo or even to account for observations just by collapse and differential rotation in the protogalactic cloud.World Scientific Publ Co Pte LtdUniversidad Complutense de Madrid20112011-12-2820112011-12-28journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/20.500.14352/44252reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/442522026-06-02T12:44:21Z
dc.title.none.fl_str_mv The dark magnetism of the Universe
title The dark magnetism of the Universe
spellingShingle The dark magnetism of the Universe
López Maroto, Antonio
53
Fields
Energy
Photon
Origin
Ghost
Física (Física)
22 Física
title_short The dark magnetism of the Universe
title_full The dark magnetism of the Universe
title_fullStr The dark magnetism of the Universe
title_full_unstemmed The dark magnetism of the Universe
title_sort The dark magnetism of the Universe
dc.creator.none.fl_str_mv López Maroto, Antonio
Beltrán Jiménez, José
author López Maroto, Antonio
author_facet López Maroto, Antonio
Beltrán Jiménez, José
author_role author
author2 Beltrán Jiménez, José
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Fields
Energy
Photon
Origin
Ghost
Física (Física)
22 Física
topic 53
Fields
Energy
Photon
Origin
Ghost
Física (Física)
22 Física
description Despite the success of Maxwell's electromagnetism in the description of the electromagnetic on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that the problems of dark energy and the origin of cosmic magnetic fields could be pointing to a modification of Maxwell's theory on large scales. Here, we review such a proposal in which the scalar state which is usually eliminated by means of the Lorenz condition is allowed to propagate. On super-Hubble scales, the new mode is essentially given by the temporal component of the electromagnetic potential and contributes as an effective cosmological constant to the energy-momentum tensor. The new state can be generated from quantum fluctuations during inflation and it is shown that the predicted value for the cosmological constant agrees with observations, provided inflation took place at the electroweak scale. We also consider more general theories including non-minimal couplings to the spacetime curvature in the presence of the temporal electromagnetic background. We show that both in the minimal and non-minimal cases, the modified Maxwell's equations include new effective current terms which can generate magnetic fields from sub-galactic scales up to the present Hubble horizon. The corresponding amplitudes could be enough to seed a galactic dynamo or even to account for observations just by collapse and differential rotation in the protogalactic cloud.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-12-28
2011
2011-12-28
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/44252
url https://hdl.handle.net/20.500.14352/44252
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv World Scientific Publ Co Pte Ltd
publisher.none.fl_str_mv World Scientific Publ Co Pte Ltd
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422941141204992
score 15.300724

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