Timeline is an enjoyable sci-fi movies, probably the book is based on, is deeper and more sophisticated, in particular the medieval setting was beautiful when the group of archeologists is sent back in time. I take this opportunity to investigate not just the physical reality of time travel, but the validity and the logical consequences of time travel as is suggested in the film: a great combination machine instead sends them to teleport objects through a passage of time in 1357 . Now it does not matter if there's a lot of science fiction in all this, however, has the conception of time emerge. These characters can change past events: an archaeologist to find a passage to break a sacred painting, but before leaving for a trip back in time, he had discovered a wall painting to a large extent destroyed, and even a fellow who is down there in the past (and that is love cut off an ear), before leaving for this trip in time, had found the tomb of a couple where the man had an ear cut off, and the woman will be the one that you love and that remains in the past. Basically, the present (at the time they leave) had already changed by the actions that these archaeologists have made going into the past. What does this mean? What is presented is a hyper-determinism, all the time and events are determined in their conduct, in this scenario if you can travel back in time, then these trips are already causally determined. The situation means that there is only one timeline, in fact, changing the past, change the future, and all are found or returned to the same timeline. If a wall is broken in the past, the future for all, that wall will be broken. Now comes spontaneously to the usual questions, but if I killed a distant pro-parent? Then change the future, would constitute a future in which I can not exist and therefore I would not go back in time, but if it is valid, the hyper-determinism that emerges, this means that events paradoxical as this killing, are impossible, if the universe were "captain" would be canceled and of themselves, restoring a past-future-compatible with some of the time travel (assuming they are possible) among those "non-paradoxical" (eg "do not cancel "). I had never thought of this logical possibility, it is certainly physically extravagant, but it would logically plausible and conceivable. The thing that makes me smile is that one goes back in time almost certainly with the intent to change the future, and in doing so everything is already determined, including his own decision to go back in time ...
There is another curious point about this sort of hyper-determinism. Without time travel, the existence of a strict determinism (theoretically ruled by quantum mechanics) can lead us to conceive of a static four-dimensional universe, in which the temporal dimension can be represented very well and replaced with an additional spatial dimension. But if this scenario we introduce a deterministic time travel, what happens? The only way to imagine a "step backward" is through a fifth dimension, or, in the static four-dimensional world as given, there would be a movement or passage of time still need a fifth dimension that represent travel in this four-dimensional universe. Virtually hyper-determinism requires an additional timeline, as well as ours, where you should be able to travel in turn, or otherwise no longer hyper-determinism and hence it leaves room for paradox (created at a higher level ), or we would need to add another timeline where you can not travel (to make deterministic one just added) and so on ad infinitum.
Surely there are many concepts of time travel are logically possible, but just imagine, given the paradoxes that might actually be part of this universe (no one can exclude a priori). The final say is always for empirical investigation physical sciences.
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