causality is probabilistic in nature afterall? You go back in time and all possible paths are traversed and the wave function collapses to a new future which still allows you to travel back in time even though in this path you have done something to kill yourself off. Many Worlds is just a different interpretation of quantum causality. If something works in Many Worlds, it should work equally well in the Transactional Interpretation and in the Copenhagen Interpretation. There we have informational causal links between the past and the future or we have consciousness mediating reality. There are lots of ways out of killer time paradoxes. Also you may want to look up Lockwood and Deutsch's article in Scientific American - I think it was titled "The Physics of Time Travel."

• Time Travel? - bkparque - October 3, 2001 - 23:05 UTC