Magnetic field generation from cosmological perturbations

Details Magnetic field generation from cosmological perturbations Magnetic field generation from cosmological perturbations

2005-02-15

arxiv.org/abs/astro-ph/0502283v4

Phys.Rev.Lett. 95 (2005) 121301

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, published version in Physical Reveiw Letters

Scientific paper

10.1103/PhysRevLett.95.121301

In this letter, we discuss generation of magnetic field from cosmological perturbations. We consider the evolution of three component plasma (electron, proton and photon) evaluating the collision term between elecrons and photons up to the second order. The collision term is shown to induce electric current, which then generate magnetic field. There are three contributions, two of which can be evaluated from the first-order quantities, while the other one is fluid vorticity which is purely second order. We estimate the magnitudes of the former contributions and shows that the amplitude of the produced magnetic field is about $\sim 10^{-19} {\rm G}$ at 10Mpc comoving scale at the recombination. Compared to astrophysical and inflationary mechanisms for seed-field generation, our study suffers from much less ambiguities concerning unknown physics and/or processes.

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