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I am not sure Eric. I think there are the problems of causality being breached - what if you shoot a parent before you were conceived etc. This is sometimes countered by ideas of a multiverse. Energy conservation may not be right. As was pointed out to me in another thread, it is really energy-momentum that is conserved and it seems there are cosmological theories that do not conserve energy - I think the Dark Energy concept does not conserve energy. In any case, even without this idea, any energy conservation would be in space-time not just space. It is not clear that moving back in time would violate energy conservation. I think, though, this would have to be tied in with a multiverse idea, then there are some issues with energy (quite a lot for an infinite set of universes).
If we had enough energy, we could create a planet populated entirely by Geezers! That is indeed a terrifying thought.
Quote from: JP on 04/06/2010 05:56:14If we had enough energy, we could create a planet populated entirely by Geezers! That is indeed a terrifying thought.Seems quite logical to me. Obviously, we would all agree with each other, thereby eliminating any unnecessary expenditure of energy.
Quote from: Geezer on 04/06/2010 06:14:27Quote from: JP on 04/06/2010 05:56:14If we had enough energy, we could create a planet populated entirely by Geezers! That is indeed a terrifying thought.Seems quite logical to me. Obviously, we would all agree with each other, thereby eliminating any unnecessary expenditure of energy.But what if they're wrong? or they make a mistake?
Quote from: Eric A. Taylor on 07/06/2010 12:22:42Quote from: Geezer on 04/06/2010 06:14:27Quote from: JP on 04/06/2010 05:56:14If we had enough energy, we could create a planet populated entirely by Geezers! That is indeed a terrifying thought.Seems quite logical to me. Obviously, we would all agree with each other, thereby eliminating any unnecessary expenditure of energy.But what if they're wrong? or they make a mistake?These scenarios are so obviously improbable that I think we can safely ignore them.
Indeed--that would be a violation of the Geezertainty principle.