Is time travel possible?

Different senses of "possible"

  • It is possible that p = p is consistent with X.

Different forms of "time-travel"

  1. Travelling across parallel universes (trans-world)
  2. Discontinuous jump into the past - raises question about personal identity
  3. Time-travel into the future - a consequence of time-dilation in special relativity

Time-travel a la Godel