Dark matter is one slippery substance. As far as we can tell, it has to exist for our current models of the Universe to work. But not only can we not see it, feel it, or interact with it in any way – we're not even sure what dark matter really is.
Despite how well this particular type of dark matter works in our models, there are still a couple of issues. A big one is called the
, where the inferred density of dark matter in galaxies doesn't line up with what's known as N-body simulations.These simulations suggest that to explain their current structure and movement, in low-matter galaxies dark matter should be 'cuspy' – meaning it's most concentrated around the cusp or outside of the galaxy. But observations tell us that most dwarf galaxies seem to hold their dark matter in the middle.
This paper is definitely not the first, and likely won't be the last to try and solve these dark matter issues, but the team has proposed a new tactic.
Non-minimal coupling is a bit of a misnomer. It means that the dark matter is directly coupled to a curvature in spacetime called the . Simply put, it's a new type of interaction between dark matter and gravity. If non-minimal coupling is happening, the dark matter interacts with spacetime in a different way than regular matter does.
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