From Science News, April 9, 2018: For the first time, physicists are snooping on some of the likeliest hiding places for hypothetical subatomic particles called axions, which could make up dark matter. So far, no traces of the particles have been found, scientists with the Axion Dark Matter Experiment, ADMX, report April 9 in Physical Review Letters.
axion
New result draws on 30 years of research and development and begins the definitive search for axion particles.
Scientists at Fermilab and the University of Chicago are planning to search for hypothesized invisible particles using cutting-edge quantum sensor technology.
Scientists don’t yet know what dark matter is made of, but they are full of ideas.