Quantum entanglement is where particles act as one over a long distance. In physics for some retarded reason dimensions can mean like 5 things ( seriously we need people better at naming stuff) so you have to be more specific. Infinite universes most likely. Dark matter is what we have named the force slowing things down we think it is a form of matter that does not interact with light so its "dark".
RE: We might have already discovered wormholes and a new paper provides a way to use them?!