Cosmic Recombination in the Presence of Primordial Magnetic Fields

Understand

Primordial magnetic fields (PMFs) may explain observations of magnetic fields on extragalactic scales.

• They are most cleanly constrained by measurements of cosmic microwave background radiation (CMB) anisotropies.
• Their effects on cosmic recombination may even be at the heart of the resolution of the Hubble tension.
• We present the most detailed analysis of the effects of PMFs on cosmic recombination to date.