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Title: Efficient Highly Subsonic Turbulent Dynamo and Growth of Primordial Magnetic Fields
Federrath, Christoph
Trivedi, Pranjal
Banerjee, Robi
Dept. of Physics
Keywords: Physics
Issue Date: Mar-2021
Publisher: American Physical Society
Citation: Physical Review Letters, 126(9), 091103.
Abstract: We present the first study on the amplification of magnetic fields by the turbulent dynamo in the highly subsonic regime, with Mach numbers ranging from 10−3 to 0.4. We find that for the lower Mach numbers the saturation efficiency of the dynamo (Emag/Ekin) sat increases as the Mach number decreases. Even in the case when injection of energy is purely through longitudinal forcing modes, (Emag/Ekin)sat≳10−2 at a Mach number of 10−3. We apply our results to magnetic field amplification in the early Universe and predict that a turbulent dynamo can amplify primordial magnetic fields to ≳10−16 G on scales up to 0.1 pc and ≳10−13 G on scales up to 100 pc. This produces fields compatible with lower limits of the intergalactic magnetic field inferred from blazar γ-ray observations.
ISSN: 1079-7114
Appears in Collections:JOURNAL ARTICLES

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