The seed magnetic field generated during recombination

Fenu, Elisa; Pitrou, Cyril; Maartens, Roy

doi:10.1111/j.1365-2966.2011.18554.x

Cited by 59 publications

(97 citation statements)

References 62 publications

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“…However, mechanisms operating in the radiation dominated era (Harrison 1970;Zakharov & Anikanov 1992) or during recombination (e.g. Berezhiani & Dolgov 2004;Takahashi et al 2008;Fenu et al 2011), requiring some level of vorticity (possibly re-generated at the second order in perturbations), E-mail:jdurrive@ias.u-psud.fr; have also been proposed. Finally, astrophysical processes operating after recombination, capable of generating magnetic fields of cosmological interest have been investigated too.…”

Section: Introductionmentioning

confidence: 99%

Intergalactic magnetogenesis at Cosmic Dawn by photoionization

Durrive

Langer

2015

Mon. Not. R. Astron. Soc.

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We present a detailed analysis of an astrophysical mechanism that generates cosmological magnetic fields during the Epoch of Reionization. It is based on the photoionization of the Intergalactic Medium by the first sources formed in the Universe. First the induction equation is derived, then the characteristic length and time scales of the mechanism are identified, and finally numerical applications are carried out for first stars, primordial galaxies and distant powerful quasars. In these simple examples, the strength of the generated magnetic fields varies between the order of 10 −23 G on hundreds of kiloparsecs to 10 −19 G on hundreds of parsecs in the neutral Intergalactic Medium between the Strömgren spheres of the sources. Thus this mechanism contributes to the premagnetization of the whole Universe before large scale structures are in place. It operates with any ionizing source, at any time during the Epoch of Reionization. Finally, the generated fields possess a characteristic spatial configuration which may help discriminate these seeds from those produced by different mechanisms.

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Section: Introductionmentioning

confidence: 99%

Intergalactic magnetogenesis at Cosmic Dawn by photoionization

Durrive

Langer

2015

Mon. Not. R. Astron. Soc.

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“…Also, one can readily write our key equations in terms of metric variables by adoption of a suitable tetrad as was done in [5].…”

Section: Discussionmentioning

confidence: 99%

“…This mechanism rests on the fact that non-zero vorticity in the pre-recombination photon-baryon plasma can generate weak magnetic fields of about ∼ 10 −25 G. However, vorticity is not a generated mode at first order in perturbation theory and has to be put in as an initial condition. Second order treatments of the pre-recombination plasma in terms of a Kinetic theory description has also been used to generate the required seed fields [5][6][7][8][9][10]. The key idea is a preferential Thompson scattering of photons off free electrons, over the scattering off protons (the scattering off protons is suppressed by a factor (m e /m p )…”

Section: Introductionmentioning

confidence: 99%

Cosmic electromagnetic fields due to perturbations in the gravitational field

Mongwane

Dunsby²,

Osano³

2012

Phys. Rev. D

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We use non-linear gauge-invariant perturbation theory to study the interaction of an inflation produced seed magnetic field with density and gravitational wave perturbations in an almost FriedmannLemaître-Robertson-Walker (FLRW) spacetime with zero spatial curvature. We compare the effects of this coupling under the assumptions of poor conductivity, perfect conductivity and the case where the electric field is sourced via the coupling of velocity perturbations to the seed field in the ideal magnetohydrodynamic (MHD) regime, thus generalizing, improving on and correcting previous results. We solve our equations for long wavelength limits and numerically integrate the resulting equations to generate power spectra for the electromagnetic field variables, showing where the modes cross the horizon. We find that the interaction can seed Electric fields with non-zero curl and that the curl of the electric field dominates the power spectrum on small scales, in agreement with previous arguments.

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“…However, the amplitude of the vector mode generated in these models highly depends on their model parameters. When we expand cosmological perturbations up to the second order, the nonlinear coupling of the first-order scalar modes naturally induces the second-order vector and tensor modes [12][13][14][15][16][17][18][19]. Since the amplitude of the first-order scalar mode is precisely determined by recent observations, the amplitudes of second-order vector and tensor modes can be predicted without introducing additional model parameters.…”

Section: Introductionmentioning

confidence: 99%

Observable cosmological vector mode in the dark ages

Saga

2016

Phys. Rev. D

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The second-order vector mode is inevitably induced from the coupling of first-order scalar modes in cosmological perturbation theory and might hinder a possible detection of primordial gravitational waves from inflation through 21cm lensing observations. Here, we investigate the weak lensing signal in 21cm photons emitted by neutral hydrogen atoms in the dark ages induced by the second-order vector mode by decomposing the deflection angle of the 21cm lensing signal into the gradient and curl modes. The curl mode is a good tracer of the cosmological vector and tensor modes since the scalar mode does not induce the curl one. By comparing angular power spectra of the 21cm lensing curl mode induced by the second-order vector mode and primordial gravitational waves whose amplitude is parametrized by the tensor-to-scalar ratio r, we find that the 21cm curl mode from the second-order vector mode dominates over that from primordial gravitational waves on almost all scales if r 10 −5 . If we use the multipoles of the power spectrum up to ℓmax = 10 5 and 10 6 in reconstructing the curl mode from 21cm temperature maps, the signal-to-noise ratios of the 21cm curl mode from the second-order vector mode achieve S/N ≈ 0.46 and 73, respectively. Observation of 21cm radiation is, in principle, a powerful tool to explore not only the tensor mode but also the cosmological vector mode.

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The seed magnetic field generated during recombination

Cited by 59 publications

References 62 publications

Intergalactic magnetogenesis at Cosmic Dawn by photoionization

Intergalactic magnetogenesis at Cosmic Dawn by photoionization

Cosmic electromagnetic fields due to perturbations in the gravitational field

Observable cosmological vector mode in the dark ages

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