Why Do We Think Dark Matter Is a Particle?

There was a moment in early dark matter thought where people had this idea, this argument for why dark matter should be ticle. And it goes by the name of the whimp miracle. This is really fun, because it tells you something about the human side of doing physics. It's like somebody was doing calculations, and the saw these numbers come together on a paper that really suggested that darkmatter should be a particle. Almost ike these numbers were a miracle. Not an over through religious experience, but it's deafinly, a powerful moment. So, to be on the programme, we'll be asking the question, why do physicists think dark matter is a particle? And not