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Paper: Magnetic Field Generation During the Formation of the First Stars
Volume: 453, Advances in Computational Astrophysics: Methods, Tools, and Outcome
Page: 51
Authors: Sur, S.; Federrath, C.; Schleicher, D.; Banerjee, R.; Klessen, R. S.
Abstract: Recent advances in numerical simulations of cosmological structure formation has revealed the ubiquity of turbulence in the early Universe suggesting that the primordial gas is highly turbulent during the formation of the first stars. This has strong implications on the generation of magnetic fields via small-scale dynamo action. Using high-resolution numerical simulations, we show that the turbulence is driven by the gravitational collapse on scales of the order of the local Jeans length, which leads to an exponential amplification of the magnetic field by the small-scale dynamo. The field amplification by the dynamo is stronger than the amplification that could be achieved by pure gravitational compression of the field lines. We find that the presence of the small-scale dynamo can only be identified in numerical simulations where the turbulent motions in the central collapsing core are resolved by at least 32 grid cells.
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