You mean Einstein's GR? Sure it can. Spoiler: Physics Quantum physics and GR only conflict with each other in the circumstance of the singularity, other than that, there are little to no conflicts. I could explain it in greater detail if you'd like, but the main issue comes from the fact that GR requires smooth spacetime and QM has a minimum unit of both space and time. You are confused by pop science about terminology, when scientists speak of things, they choose their words very carefully, journalists, not so much. GR has valid solutions that would equate to a white hole, but it requires some exotic matter that has a negative energy density. We've never seen such a things and don't expect such a thing to be stable. Being mathematically valid, and actually predicting existence are not the same thing. An Alchierre drive is mathematically valid in GR, but again requires negative energy density to achieve, ergo impossible. We know dark matter exists because we can see it. It's invisible to us only in terms of light, it's gravity we can see very clearly. It's like being in the water and using a telescope to look out. The water would be invisible to us, but we'd see things in the distance distorted by the density differences between us and it. The same thing happens in space because space curves in the presence of gravity. We've used math to map the dark matter, it's definitely there, there have been lots of proposals, all of which have determined to be invalid so far. There are a lot of mathematical reasons why folding spacetime is not possible, for one, it would break the concept of smooth space.