Primordial Magnetic Fields and the Hubble Tension

by Karsten Jedamzik (Université de Montpellier)

Thursday 27 Jan 2022, 15:00 → 16:30 Europe/Berlin

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.

Join the meeting here: Zoom link

Meeting ID: 921 1801 0804
Passcode: 68144845