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Primordial Density Perturbations from Magnetic Fields
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Perturbations to the cosmic baryon density - and thus to the total-matter density - can be induced by magnetohydronamic forces if there are primordial magnetic fields. The power spectrum for these density perturbations was first provided in 1996, but without much in the way of detail in the derivation, and there has been confusion in the intervening years about this calculation. In this brief note, we re-derive this power spectrum using modern conventions, provide a simplified result, and identify some of the discrepancies in the literature.
Forward citations
Cited by 2 Pith papers
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Magnetically assisted primordial scalar perturbations: Scalar-Induced Gravitational Waves
PMF-sourced scalar perturbations during a kination-like reheating can induce a gravitational-wave background that dominates over the direct PMF tensor signal and may be detectable at mHz-kHz frequencies.
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Probing Cosmic Magnetism with Rotation Measure-Squared-Galaxy Cross-Correlations
RM²–galaxy cross-correlations can isolate the magnetic field contribution from specific redshifts and may be detectable with SKA-era RM catalogs.
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