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


Dark Matter


“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 Model radiation, known as the Cosmic Microwave Background,” Jeff Dror, with the Santa Cruz Institute for Particle Physics, told The Daily Galaxy. “Furthermore,” adds Dror, “experiments designed to search for axion dark matter can be repurposed to search for the CaB and potentially lead to the discovery of the axion, which would also teach us a great deal about the history of our universe.”