Well, there's nothing saying we CAN'T bend or fold space, but we can't do it. This type of technology would require exotic matter, which would display a negative mass. If we were able to find exotic matter, it would open up a lot of Star Trek/Star Wars technologies, including warp drive and levitation.
Teleportation is a lot less likely. We can do it on a sub-atomic scale, but the energy required to teleport a human would destroy a country the size of Mexico. Not to mention the computing data that would need to be processed to reassemble a person (imagine a stack of hard drives that spanned 1/2 the length of the galaxy), and the ethical question "Did I just kill a person and reassemble a completely different person?"