Let's define free will as the ability for a human being to make a choice that does not completely depend on the history of the universe. The universe may be assumed to be indeterministic. Any simple choice will do: am I going to order a Coke or a Sprite?
Has anyone described what the universe must be like in order for this kind of free will to be able to exist? A universe where an agent making the choice exerts causal influence on the universe? In what kind of universe would this be possible, while not running afoul of dualism?