# The seed magnetic field generated during recombination

@article{Fenu2010TheSM, title={The seed magnetic field generated during recombination}, author={Elisabetta Fenu and Cyril Pitrou and Roy Maartens}, journal={Monthly Notices of the Royal Astronomical Society}, year={2010}, volume={414}, pages={2354-2366} }

Non-linear dynamics creates vortical currents when the tight-coupling approximation between photons and baryons breaks down around the time of recombination. This generates a magnetic field at second order in cosmological perturbations, whose power spectrum is fixed by standard physics, without the need for any ad hoc assumptions. We present the fully general relativistic calculation of the magnetic power spectrum, including the effects of metric perturbations, second-order velocity and photon… Expand

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#### References

SHOWING 1-10 OF 53 REFERENCES

Primordial magnetic fields from second-order cosmological perturbations: tight coupling approximation

- Physics
- 2009

We explore the possibility of generating large-scale magnetic fields from second-order cosmological perturbations during the pre-recombination era. The key process for this is Thomson scattering… Expand

Large-scale magnetic fields from density perturbations

- Physics
- 2005

We derive the minimal seed magnetic field which unavoidably arises in the radiation and matter eras, prior to recombination, by the rotational velocity of ions and electrons, gravitationally induced… Expand

Cosmological magnetic fields from nonlinear effects

- Physics
- 2007

In the standard cosmological model, magnetic fields and vorticity are generated during the radiation era via second-order density perturbations. In order to clarify the complicated physics of this… Expand

Generation of large scale magnetic fields at recombination epoch

- Physics
- 2004

Abstract It is argued that large scale cosmic magnetic field could be generated in the primeval plasma slightly before hydrogen recombination. Non-zero vorticity, necessary for that, might be created… Expand

Challenges for creating magnetic fields by cosmic defects

- Physics
- 2008

We analyze the possibility that topological defects can act as a source of magnetic fields through the Harrison mechanism in the radiation era. We give a detailed relativistic derivation of the… Expand

Can the observed large scale magnetic fields be seeded by helical primordial fields

- Physics
- 2009

Gravitational wave production induces a strong constraint on the amplitude of a primordial magnetic field. It has been shown that the nucleosynthesis bound for a stochastic gravitational wave… Expand

Cosmological Structure Formation Creates Large-Scale Magnetic Fields

- Physics
- 2006

This paper examines the generation of seed magnetic fields due to the growth of cosmological perturbations. In the radiation era, different rates of scattering from photons induce local differences… Expand

Electromagnetic Properties of the Early Universe

- Physics
- 2008

Detailed physical processes of magnetic field generation from density fluctuations in the prerecombination era are studied. Solving Maxwell equations and the generalized Ohm's law, the evolutions of… Expand

Cosmological perturbations at second order and recombination perturbed

- Physics
- 2009

We derive the full set of second-order equations governing the evolution of cosmological perturbations, including the effects of the first-order electron number density perturbations, δe. We provide… Expand

Generation of magnetic field in the pre-recombination era

- Physics
- 2004

We study the possibility of generating magnetic fields during the evolution of electron, proton and photon plasma in the pre-recombination era. We show that a small magnetic field can be generated in… Expand