Cosmological Magnetogenesis driven by Radiation Pressure

Details Cosmological Magnetogenesis driven by Radiation Pressure Cosmological Magnetogenesis driven by Radiation Pressure

2002-12-04

arxiv.org/abs/astro-ph/0212108v1

Phys.Rev. D67 (2003) 043505

Astronomy and Astrophysics

Astrophysics

9 pages, 2 figures

Scientific paper

10.1103/PhysRevD.67.043505

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.

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