My last understanding was that it fell outside the standard model and would require some kind of new elementary particle to explain. It doesn’t interact with light or electromagnetism. The only real basis we have for it is gravitational abnormalities.

I guess I have to ask: why do you presume there exists an undetectable force that makes your equations work and not that the equations don’t account for everything?

Seems silly. You would never believe 85% of software bugs were caused by unseen, undetectable stochastic physics errors that only manifested as a system crash. The fact that doing the same thing over and over again produces the same result certainly doesn’t cement that theory in my mind.