21 cm line signal from magnetic modes
Kerstin E. Kunze
TL;DR
This paper investigates how primordial magnetic fields influence the 21 cm signal from the early universe, using simulations to explore potential observational signatures and constraints with upcoming radio telescopes.
Contribution
It presents the first detailed numerical simulations of the nonlinear density field and 21 cm signal considering magnetic fields with various strengths and spectral indices.
Findings
Magnetic fields enhance small-scale matter power spectrum.
Simulations show distinctive 21 cm signatures for different magnetic field parameters.
Potential to constrain magnetic fields with SKA observations.
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 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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.