Krasnikov on Time-Travel
Hi Guys
A recent e-preprint by Krasnikov suggests that artificial time-machines are impossible, but he doesn't rule out natural retro-time systems that might have been around since the Big Bang.
Personally I like the idea of the "time viewer" which allows looking back in time, but no way of influencing past events. I like to imagine that the darkening of the sky around JC's crucifixion was due to too many time-viewers in the area...
Adam
