http://arxiv.org/abs/2304.03299
Compensated isocurvature perturbations (CIPs) are perturbations to the primordial baryon density that are accompanied by dark-matter-density perturbations so that the total matter density is unperturbed. Such CIPs, which may arise in some multi-field inflationary models, can be long-lived and only weakly constrained by current cosmological measurements. Here we show that the CIP-induced modulation of the electron number density interacts with the electron-temperature fluctuation associated with primordial adiabatic perturbations to produce, via the Biermann-battery mechanism, a magnetic field in the post-recombinaton Universe. This magnetic field may be larger than that (produced at second order in the adiabatic-perturbation amplitude) in the standard cosmological model and may provide seeds for galactic dynamos.
J. Flitter, C. Creque-Sarbinowski, M. Kamionkowski, et. al.
Mon, 10 Apr 23
25/36
Comments: 7 pages, 2 figures
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