I think the first thing I liked about the stories of time travel is somehow helped ease the longing that it caused have read stories of cowboys, Roman soldiers or pirates, and given realize that, chao, times are gone. Also there is something (a lot) of striking a character who can get first hand information about those times, someone who can see the picture of the Last Supper or hear about a historic event with a smile and say "I was there"; and, eventually, you can try to alter the course of events.
Sure you can have unintended consequences. When traveling to the past can influence it so that when they return to their "home time" the traveler will find that their world has changed. Here there is the "snowball effect" in which an insignificant event triggers another more, and this one most important, with consequences that are amplified to result in large-scale events, such as "bum." Ray Bradbury in "the sound of thunder" said it best: "with the death of the caveman, a billion other men will never leave the womb. Perhaps Rome was not moose ever on seven hills. Perhaps Europe is forever a dark forest, and only grow healthy and prolific Asia. Step on a mouse and you crush the Pyramids. Step on a mouse and leave their mark, like an abyss in eternity. "
Then, if the world from which the traveler is due to, say, to look serious, a" temporal reality "R 1 , and travel all the events triggered R 2 , how can there be a world traveler if the next does not exist, or rather not exist when you have traveled? How travel can take place that causes its own impossibility? At this point it is more practical and safe is to engage in other types of travel. Following a rabbit through the trunk of a tree, for example. But if you insist on making the jump time anyway, will see that it is possible to avoid accidentally deleted on the road.
One possibility is to consider time as a personal and subjective: what you do not change after the trip to the "temporal reality" that is left, as the time a person does not affect the other. This is what happens to Henry Hassel, a professor at the University Unknown, who upon discovering that his wife has a lover decides to kill the grandfather of the infidel (and that is, why go the simple way, if there is complicated?) Back in time discover that nothing has changed, so to travel again, just to Washington, Napoleon, Mohammed, deletes a mushroom Paris by Marie Curie ... and finds absolutely no change in the attitude (or existence) of his unfaithful wife. This can confuse the novice traveler, but it is explained if one considers the time a personal matter in which there is no "universal constant", or, in the words of one character: "We're like millions of noodles in the same pan . In no time a traveler can find another traveler in the past or the future. Each of us must travel up and down for their own noodles only. " Seen this way, a traveler can stay in the world that" creates "after causing a big change to see what happens next (well, it always does, if only for a few seconds), but the jump forward always returns to the "temporal reality" of the departed. There is a kind of umbilical cord that connects to your future and to move in that direction is no changes or surprises for reality to come, regardless of the changes that resulted. In other words, creates the ramifications R 2, R 3 , R 4 and all he wants, but to go "up" in a jump can not reach a different industry than that of the departed. This method of travel has its own risks, but that's another story.
is also possible for travelers to keep their identity intact, while changing the reality to come back. In Ray Bradbury's story, two men travel to hunt dinosaurs and returning found that the outcome of presidential elections has changed. And notice that the would-be travelers had nothing to do with the trophy hunting (it was intended, it was a dinosaur he would die soon), but something much smaller and, one would say, insignificant: a green butterfly, golden, low dead the boot of one of the hunters. Again, the "snowball effect" or literally, the butterfly effect. It also serves as an example the case of young McFly, who in the 80's leaps 30 years into the past, meeting his future parents and causing fundamental changes in their relationship. On returning (to the future, of course) is changed in the character and appearance. While he, traveler caused the change, maintaining its identity and the changes do not affect him directly (his parents live in the same place, he is recognized as a child, etc.) Remember that at some point in their adventure risked vanish, so travel in this way is not entirely risk free. McFly And somehow he was lucky that her parents, full of new confidence in themselves, have not taken steps, such as family planning, which would have eliminated. In any case, should not cause major changes in life and decisions of their parents, travelers can still be part of a world that has changed. Amending a "temporary reality, yes, but there is a place reserved in this and the events, very kindly, are arranged to allow the existence of the traveler and the possibility of their trip.
Now, if what you are looking for a method of travel insurance, with total security is not going to change anything, it is also possible. A small scale example: with the help of Isaac Asimov, a creates a physical Automated sending a particle of matter in the past, exactly 5 minutes. For a traveler with ambition this may seem frustrating. But note that the energy meter, exactly 5 minutes before sending the particle, jumps to twice normal: it is logical if we consider that the same particle is there twice. The key question to understand how this works is: What happens if after the detection process is interrupted? Correct answer: if you interrupt the travel of the particle now, it would not have traveled before . If there is no clear logic of this method of travel on the same story takes on a larger scale, translates and sends a chemistry textbook to ancient Greece, with the best of intentions. And the world resulting from this change is precisely the current. Why? Because scientific progress and technological advances on the shoulders of society in which it was produced and can not come entirely alien to it. Then, the Greeks of the time (the time of the Greeks) were unable to fully understand the knowledge received: no breakthroughs, only the theories of Democritus like something out a little "air" and some poems relating to directly received wisdom of the gods, none of which was alien to the "temporal reality" from which you sent the book. So, things change to be like had ever been. Ursula, "100 Years of Solitude", used to say that time is circular to see that attitudes and events are repeated through generations. But one might say that this is a step in a spiral, as bad than good things happen one after another, and that is circular in those cases where cause and effect seems to depend on viewpoint. In the movie "12 Monkeys", the protagonist travels back to investigate a virus that wreaks havoc on his time and ends up causing the events that were part of the world since he left. Does it cause? Effectiveness? "Default?
Or are the Cronogatos, excellent guardians. Seeing a stranger meowed loudly, with the advantage that, if they saw him today, yesterday began to meow. This prevented its owner 24 hours in advance. But they were also very fragile, and who get the flu and died a few days before been infected. Of course, the traveler asks: What if, knowing of the future arrival of the intruder, they would have taken steps to ensure that Cronogato could not feel his presence? What if, after the death of the cat (but before disease), were prevented from spreading and die? These questions are meaningless, since the fact that the cat is dead means that he was infected ... in the near future. There is no time "manipulable" after the death of the cat and before their infection, because the infection is prior to death, but the facts are willing (apparently) backwards. The passenger side of R 1 and "create" their actions precisely R 1 . Or: time travel causes the traveler (and world) have been exactly as they are for their time travel was possible. JL Borges says in a poem for a version of the I Ching that "the future is as irrevocable as the rigid yesterday" and that seems to be the case. So you can travel whenever you want without fear of changing anything. Although sometimes that is precisely the intention of a journey.
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