Axions could be the fossil of the universe researchers have been waiting for

No one knows what happened in the universe for its first 400,000 years, but a new paper suggests discovering the hypothetical particle axion could shed light on the early history of the universe. What's more, current dark matter experiments may have already detected it in its data.

source https://www.sciencedaily.com/releases/2021/06/210607110258.htm