Hal Finney (
Tue, 5 May 1998 17:10:25 -0700

warren olson, <>, writes:
> Is anyone else interested in the idea of time travel via a macroscopic
> wormhole? In theory the idea doesnt necessarily contradict any physics
> laws, and presently only one known thing could damper the idea based on
> chronological laws, but even that isnt proven to be a formidable
> problem. Anyone else think anything of it or just a waste or research
> time?

It's certainly intriguing that our best models of the universe seem to
allow for something as paradoxical as time travel. The question is,
is there something wrong with the models, or something wrong with the
universe? :-)

Oops, my prejudice is showing. I can hardly believe that time travel
will be possible because of the paradoxes and contradictions it would

David Deutsch has suggested that the paradoxes could be resolved if you
combine time travel with parallel universes, so that when you go back into
the past you are moving into a parallel universe. That way you never close
the circle and can't change your past, avoiding contradictions. But I
haven't seen a rigorous explanation of this idea.