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A new paper hypothesizes how the amount of dark matter could have grown exponentially in the early universe.

(Inside Science) -- Eighty-five percent of the matter in the universe is thought to be "dark" matter invisible to humans and our scientific instruments. But scientists don't know what dark matter is made of or how it was created in the early universe.  Now, a group of researchers has proposed a new recipe for the mysterious substance: a dark matter particle colliding with an ordinary matter particle and transforming it into a new dark matter particle. This process would have continued until the universe settled at the amount of dark matter present today. 

(Inside Science) -- Eighty-five percent of the matter in the universe is thought to be "dark" matter invisible to humans and our scientific instruments. But scientists don't know what dark matter is made of or how it was created in the early universe.  Now, a group of researchers has proposed a new recipe for the mysterious substance: a dark matter particle colliding with an ordinary matter particle and transforming it into a new dark matter particle. This process would have continued until the universe settled at the amount of dark matter present today. 

A new model explains the current density of dark matter by proposing that conventional matter converted to dark matter in the early Universe.