AMA | September 2024

13180.927 - 13203.797 Sean Carroll

So every dark matter theory gives you two things. It gives you the dark matter candidate. So what is the particle or black hole or whatever that is the dark matter? And then number two, it gives you a theory of the abundance of that dark matter. Where did it come from? Why do you get the certain amount of dark matter? Indeed, the first of these turns out to be way easier than the second.