Abstract
The origin of magnetic fields with large coherent length, called cosmological magnetic fields, has been an open question, although many models are proposed. It has been believed that cosmological magnetic fields are the resultant of amplification by the dynamo mechanism. If we believe the dynamo mechanism, we need to set seed fields in the early universe, that is, before the cosmological recombination epoch. This is because the dynamo mechanism cannot create magnetic fields from the absence of seed fields. In this part, we apply the second-order vector mode in the cosmological perturbation theory to generate seed magnetic fields. The estimation of the second-order magnetic fields has not been accomplished because there is a discrepancy between previous results with the incomplete analysis. We reproduce the previous results by the original Boltzmann code and identify the cause of the discrepancy. Consequently, we provide the fully-considered results of second-order magnetic fields.
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Saga, S. (2018). Generation of Magnetic Fields. In: The Vector Mode in the Second-order Cosmological Perturbation Theory. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-8007-4_3
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DOI: https://doi.org/10.1007/978-981-10-8007-4_3
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