I thought dark matter was only observed through movements of matter within galaxies. Outer layers of spiral galaxies are observed to move faster than they shoul

I thought dark matter was only observed through movements of matter within galaxies. Outer layers of spiral galaxies are observed to move faster than they should, so there has to be additional gravity and therefore mass that binds them on their (fast) orbits around the center. Perhaps there is a negative gravity outside of galaxies where space seems to bubble out of nowhere anyway and the universe is expanding. This seems as an attempt to combine gravity with the standard model again, which in my very amateurish understanding comes with multiple extra dimensions anyway. Isn't the higgs field basically a recently discovered additional dimension already? Among the other forms of particles that can be seen as an excitation of fields that compose these dimensions. But for extreme cases like neutron stars or black holes, we probably do need to combine these theories since gravity is a main reason these objects exist in the first place. And also isn't a curvature of space not already be an additional dimension as well? It would be mathematically as I understand it.