Non-Baryonic Matter
Material that consists of exotic subatomic particles. These subatomic particles can move slowly (cold dark matter) or fast (hot dark matter).
Non-baryonic matter is the fundamental antithesis of such matter, being any sort of matter that is not primarily composed of baryons.
After a decade of effort, the consensus was that these processes are unlikely, and the standard explanation now used for the abundance of deuterium is that the universe does not consist mostly of baryons, and that non-baryonic matter (also known as ...
What is more, in these theories there seems to be no way of concentrating baryons relative to the non-baryonic matter in an object the size of the cluster. So the fraction of baryons in the Coma Cluster should be no more than 10% or so.
 See also: Model, Mass, Light, Universe, Baryonic matter
  
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