Precise numerical estimation of the magnetic field generated around recombination

Fidler Christian; Pettinari Guido; Pitrou Cyril

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Precise numerical estimation of the magnetic field generated around recombination

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We investigate the generation of magnetic fields from nonlinear effects around recombination. As tightcoupling is gradually lost when approaching z similar or equal to 1100, the velocity difference between photons and baryons starts to increase, leading to an increasing Compton drag of the photons on the electrons. The protons are then forced to follow the electrons due to the electric field created by the charge displacement; the same field, following Maxwell's laws, eventually induces a magnetic field on cosmological scales. Since scalar perturbations do not generate any magnetic field as they are curl-free, one has to resort to second-order perturbation theory to compute the magnetic field generated by this effect. We reinvestigate this problem numerically using the powerful second-order Boltzmann code SONG. We show that: (i) all previous studies do not have a high enough angular resolution to reach a precise and consistent estimation of the magnetic field spectrum; (ii) the magnetic field is generated up to z similar or equal to 10; (iii) it is in practice impossible to compute the magnetic field with a Boltzmann code for scales smaller than 1 Mpc. Finally we confirm that for scales of a few Mpc, this magnetic field is of order 2 x 10(-29) G, many orders of magnitude smaller than what is currently observed on intergalactic scales.

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《Physical review, D》 |2016年第10期|共6页
作者
Fidler Christian; Pettinari Guido; Pitrou Cyril;
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作者单位

Catholic Univ Louvain, Ctr Cosmol Particle Phys & Phenomenol CP3 2, Chemin Cyclotron, B-1348 Louvain La Neuve, Belgium;

Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England;

Univ Paris 06, Inst Astrophys Paris, Univ Paris 04, CNRS,UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France;

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正文语种英语
中图分类粒子物理学;场论;
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Precise numerical estimation of the magnetic field generated around recombination

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