Primordial magnetic field amplification from turbulent reheating

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 s...

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Autores principales: Calzetta, Esteban Adolfo, Kandus, Alejandra
Publicado: 2010
Materias:
Cosmic magnetic fields theory
Magnetohydrodynamics
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2010_n8_p_Calzetta
http://hdl.handle.net/20.500.12110/paper_14757516_v2010_n8_p_Calzetta
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_14757516_v2010_n8_p_Calzetta2023-06-08T16:17:52Z Primordial magnetic field amplification from turbulent reheating Calzetta, Esteban Adolfo Kandus, Alejandra Cosmic magnetic fields theory Magnetohydrodynamics 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. Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kandus, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2010_n8_p_Calzetta http://hdl.handle.net/20.500.12110/paper_14757516_v2010_n8_p_Calzetta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmic magnetic fields theory
Magnetohydrodynamics
spellingShingle Cosmic magnetic fields theory
Magnetohydrodynamics
Calzetta, Esteban Adolfo
Kandus, Alejandra
Primordial magnetic field amplification from turbulent reheating
topic_facet Cosmic magnetic fields theory
Magnetohydrodynamics
description 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.
author Calzetta, Esteban Adolfo
Kandus, Alejandra
author_facet Calzetta, Esteban Adolfo
Kandus, Alejandra
author_sort Calzetta, Esteban Adolfo
title Primordial magnetic field amplification from turbulent reheating
title_short Primordial magnetic field amplification from turbulent reheating
title_full Primordial magnetic field amplification from turbulent reheating
title_fullStr Primordial magnetic field amplification from turbulent reheating
title_full_unstemmed Primordial magnetic field amplification from turbulent reheating
title_sort primordial magnetic field amplification from turbulent reheating
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2010_n8_p_Calzetta
http://hdl.handle.net/20.500.12110/paper_14757516_v2010_n8_p_Calzetta
work_keys_str_mv AT calzettaestebanadolfo primordialmagneticfieldamplificationfromturbulentreheating
AT kandusalejandra primordialmagneticfieldamplificationfromturbulentreheating
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