21 cm line signal from magnetic modes

Abstract

The Lorentz term raises the linear matter power on small scale which leads to interesting signatures in the 21 cm signal. Numerical simulations of the resuting nonlinear density field, the distribution of ionized hydrogen and the 21 cm signal at different values of redshift are presented for magnetic fields with field strength B=5 nG, and spectral indices $n_B=-2.9,-2.2$ and -1.5 together with the adiabatic mode for the best fit data of Planck13+WP. Comparing the averaged global 21 cm signal with the projected SKA1-LOW sensitivities of the Square Kilometre Array (SKA) it might be possible to constrain the magnetic field parameters.

14 pages, 60 figures

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• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Sardinia Radio Telescope observations of Abell 194 - the intra-cluster magnetic field power spectrum
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• Limits on primordial magnetic fields from primordial black hole abundance
• Primordial magnetic fields during the cosmic dawn in light of EDGES 21-cm signal
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
• Revisiting primordial magnetic fields through 21-cm physics: Bounds and forecasts
• Cross correlations of the CMB Doppler mode and the 21 cm brightness temperature in the presence of a primordial magnetic field
• Imprints of the post recombination dissipation of helical magnetic field on the Cosmic Microwave Background Radiation
• Efficiency of dynamos from an autonomous generation of chiral asymmetry
• Sensitivity of the redshifted 21 cm signal from the Dark Ages to parameters of primordial magnetic fields