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dc.contributor.author
Calzetta, Esteban Adolfo
dc.contributor.author
Kandus, Alejandra
dc.date.available
2018-09-11T17:49:01Z
dc.date.issued
2010-08
dc.identifier.citation
Calzetta, Esteban Adolfo; Kandus, Alejandra; Primordial magnetic field amplification from turbulent reheating; IOP Publishing; Journal of Cosmology and Astroparticle Physics; 2010; 8; 8-2010; 1-35
dc.identifier.issn
1475-7516
dc.identifier.uri
http://hdl.handle.net/11336/59118
dc.description.abstract
We analyze the possibility of primordial magnetic field amplification by a stochastic large scale kinematic dynamo during reheating. We consider a charged scalar field minimally coupled to gravity. During inflation this field is assumed to be in its vacuum state. At the transition to reheating the state of the field changes to a many particle/anti-particle state. We characterize that state as a fluid flow of zero mean velocity but with a stochastic velocity field. We compute the scale-dependent Reynolds number Re(k), and the characteristic times for decay of turbulence, td and pair annihilation ta, finding ta ≪ td. We calculate the rms value of the kinetic helicity of the flow over a scale Γ and show that it does not vanish. We use this result to estimate the amplification factor of a seed field from the stochastic kinematic dynamo equations. Although this effect is weak, it shows that the evolution of the cosmic magnetic field from reheating to galaxy formation may well be more complex than as dictated by simple flux freezing. © 2010 IOP Publishing Ltd and SISSA.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Cosmic Magnetic Fields Theory
dc.subject
Magnetohydrodynamics
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Primordial magnetic field amplification from turbulent reheating
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-10T16:31:44Z
dc.journal.volume
2010
dc.journal.number
8
dc.journal.pagination
1-35
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Calzetta, Esteban Adolfo. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
dc.description.fil
Fil: Kandus, Alejandra. Universidade Estadual de Santa Cruz; Brasil
dc.journal.title
Journal of Cosmology and Astroparticle Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/1475-7516/2010/08/007
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