Journal
PHYSICAL REVIEW D
Volume 108, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.108.023521
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This article discusses the perturbations to the cosmic baryon density and total matter density induced by magnetohydrodynamic forces in the presence of primordial magnetic fields. The authors rederive the power spectrum for these density perturbations provided in 1996, provide a simplified result, and identify some discrepancies in the literature.
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 rederive this power spectrum using modern conventions, provide a simplified result, and identify some of the discrepancies in the literature.
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