Some ideas are:
- You branch off into another timeline and your actions make no difference to the previous timeline
- You’ve already taken said actions but just didn’t know about it so nothing changes
- Actions taken can have an effect (so you could suddenly erase yourself if you killed your parents)
- Only “nexus” or fixed events really matter, the timeline will sort itself out for minor changes
- something else entirely
Theory: time is immutable, and the universe exists as a single timeline that repeats itself through a high-dimensional recursive or map-reduce. By “time travel,” you are essentially moving yourself across loops and jumping to a different iteration of this universe.