Primordial magnetic field amplification from turbulent reheating

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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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Autor principal: Calzetta, E.
Otros Autores: Kandus, A.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2010
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Calzetta, E. 
245 1 0 |a Primordial magnetic field amplification from turbulent reheating 
260 |c 2010 
270 1 0 |m Calzetta, E.; Departamento de Física, FCEyN-UBA and IFIBA-CONICET, Cdad. Universitaria, Buenos Aires, Argentina; email: calzetta@df.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a Departamento de Física, FCEyN-UBA and IFIBA-CONICET, Cdad. Universitaria, Buenos Aires, Argentina 
593 |a LATO - DCET - UESC, Rodovia Ilhéus-Itabuna, km 16 s/n, CEP: 45662-900, Salobrinho, Ilhéus-BA, Brazil 
690 1 0 |a COSMIC MAGNETIC FIELDS THEORY 
690 1 0 |a MAGNETOHYDRODYNAMICS 
700 1 |a Kandus, A. 
773 0 |d 2010  |g v. 2010  |k n. 8  |p J. Cosmol. Astroparticle Phys.  |x 14757516  |w (AR-BaUEN)CENRE-5511  |t Journal of Cosmology and Astroparticle Physics 
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