The Dark Matter of the Universe

In the case of Einstein, it was a deeper understanding that led to why those are equal. And you're thinking maybe there's a successor to the standard model with this? Yes, we have a candidate theory of that. We introduce an extra symmetry. It's called Peche Quinn's symmetry over by the physicists who first introduced it. But they didn't really realize how it worked in detail. The main consequence of this symmetry as a practical matter is that there's a new kind of particle that it implies that's called an axion. I got to name because I... You got to name it.