Axion
The AXION is a neutral, lightweight (10-6 to 1eV), weakly-interacting and difficult-to-detect hypothetical particle that might explain the mysteries of dark matter and the strong CP problem.
The AXION is a neutral, lightweight (10-6 to 1eV), weakly-interacting and difficult-to-detect hypothetical particle that might explain the mysteries of dark matter and the strong CP problem.