Weakly interacting massive particles
as dark matter candidates

What does ``weakly interacting massive particles'' mean? The picture:

An interesting question to think about: could there be massive particles that are weakly interacting with ``ordinary'' matter but strongly interacting with each other? Maybe we are made of type A matter and there is another kind, type B, that doesn't interact with type A except by gravity. There could be type B stars, type B planets, type B people .... This idea doesn't work so well when you think it through, but it's fun to consider.

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA soper@bovine.uoregon.edu