In this talk I consider the evolution of primordial magnetic fields (PMFs) from very early times to recombination. I show that PMFs generate small-scale, non-linear density fluctuations shortly before recombination which lead to an earlier recombination. The associated decrease of the sound horizon at recombination leads to a higher value of the Hubble constant inferred from CMB observations. PMFs thus show great potential to relive the 5 sigma Hubble tension. Intruigingly, the required field strength is such that magnetic fields in present day clusters of galaxies would be entirely primordial.
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Meeting ID: 921 1801 0804