Probably a crazy idea but perhaps possible, so let me ask... GR doesn't prevent particles, even those with mass, to travel at speeds higher than the maximal speed of light (C), if that was their initial speed. Now, the only thing traveling faster than C is expansion of our Universe. First, are there also particles 'riding' that wavefront? Second, if so, what if one end of a wormhole would appear in that region and the other somewhere inside the Universe, might it be possible that the particle riding that wavefront at speeds exceeding C enters that wormhole and then exits it inside Universe, perhaps even near Earth, and keep that speed? Third, would such a particle 'experience' (not in regard of itself, but in regard of Universe) traveling backwards in time ending in a Big Bang, while time still goes forward for the rest of Universe?