Primordial magnetic fields may help explain why measurements of the universe’s expansion do not agree.
Scientists have long known that the universe is expanding, yet there is still no agreement on how quickly that expansion is taking place.
Two leading methods used to calculate the expansion rate, known as the Hubble constant, continue to produce results that do not match. This discrepancy has become one of the most persistent challenges in cosmology and is widely referred to as the Hubble tension.
However, we wondered if an idea originally proposed to solve another cosmic mystery — the origin of cosmic magnetic fields — could help us unlock the mystery of the Hubble tension.
Our recent study investigates the possibility that extremely faint magnetic fields formed in the earliest moments after the Big Bang may influence measurements of cosmic expansion. If so, they could help clarify the source of the Hubble tension while also offering a rare window into physical processes at energies far beyond what can be reproduced in laboratories on Earth.
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