WIMPs???
•“WIMP” = Weakly interactive massive particle
–Neutrinos?
•Seem to have mass, but too small.
–Axions?
•From Wikipedia, “The axion is a hypothetical elementary particle postulated by Peccei-Quinn theory in 1977 to resolve the strong-CP problem in quantum chromodynamics (QCD).”
•As yet, not detected (axions are predicted to change to and from photons in the presence of strong magnetic fields, and this property is used for creating experiments to detect axions)