Cosmological Magnetogenesis driven by Radiation Pressure

Abstract

The origin of large scale cosmological magnetic fields remains a mystery, despite the continuous efforts devoted to that problem. We present a new model of magnetic field generation, based on local charge separation provided by an anisotropic and inhomogeneous radiation pressure. In the cosmological context, the processes we explore take place at the epoch of the reionisation of the Universe. Under simple assumptions, we obtain results (i) in terms of the order of magnitude of the field generated at large scales and (ii) in terms of its power spectrum. The amplitudes obtained (B ~ 8.10^(-6) micro-Gauss) are considerably higher than those obtained in usual magnetogenesis models and provide suitable seeds for amplification by adiabatic collapse and/or dynamo during structure formation.

9 pages, 2 figures

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• Magneto-Hydrodynamics of Population III Star Formation
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• On the First Generation of Stars
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• Magnetogenesis around the first galaxies: the impact of different field seeding processes on galaxy formation
• Dissipation of Magnetic Flux in Primordial Gas Clouds
• Dissipation of Magnetic Flux in Primordial Star Formation: From Run-away Phase to Mass Accretion Phase
• Magnetic fields from reionisation
• Cosmic Magnetism in Centimeter and Meter Wavelength Radio Astronomy
• Generation of Seed Magnetic Field around First Stars: the Biermann Battery Effect
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• Fisher Analysis on Wide-Band Polarimetry for Probing the Intergalactic Magnetic Field
• Probing Early Cosmic Magnetic Fields through Pair Echos from High-Redshift GRBs
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• Non-ideal magnetohydrodynamic simulations of the first star formation: the effect of ambipolar diffusion
• Mean Energy Density of Photogenerated Magnetic Fields Throughout the Epoch of Reionization
• Magnetizing the Cosmic Web during Reionization
• The possible existence of Pop III NS-BH binary and its detectability
• Radiative transfer dynamo effect