“Fossil of the Universe” –Extremely Elusive Axion Dark-Matter Signal

    “While it is certainly possible that axions — a hypothetical elementary particle predicted to be among the lightest particles in the universe–make up dark matter, they also may make up a source of “dark radiation” in our universe which we refer to as the Cosmic Axion Background (CaB), analogous to the observed Standard … Continue reading “Fossil of the Universe” –Extremely Elusive Axion Dark-Matter Signal