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Primordial Magnetic Fields May Ease the Hubble Tension
Key Takeaways
- Two leading methods for measuring the Hubble constant — one from cosmic microwave background patterns, one from Type Ia supernovae — disagree, a problem known as the Hubble tension.
- The cosmic microwave background route, used by telescopes such as Planck, points to an expansion rate of about 67 km/s/Mpc.
- Researchers examined whether extremely weak primordial magnetic fields created shortly after the Big Bang could help explain the discrepancy.
- Detailed simulations suggest these fields could have altered hydrogen formation in the early universe, changing the cosmic microwave background and the expansion rate inferred from it.
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DT Editorial Team··via sciencedaily.com