Well, not exactly tons of stuff. According to Michio Kaku at Bigthink.com, the list of forces that can break the light speed barrier is exactly 4 things long:
So, depending on what you consider traveling, this list is exhaustive...at least it is here. Were you to cross into another dimension or a parallel universe, the rules would most likely change. How, though, is up to you. What is the principle behind your FTL?
- The Big Bang. (head start, yet also accelerating, light will never catch up)
- Quantum entangled sub-atomic particles. (also cheating!)
- Negative Matter (a legitimate contender)
- Beams of Light? (sort of)
So, depending on what you consider traveling, this list is exhaustive...at least it is here. Were you to cross into another dimension or a parallel universe, the rules would most likely change. How, though, is up to you. What is the principle behind your FTL?