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| '''Quantum immortality''' is the ] speculation deriving from the ] ] that states the ] of ] implies that ] beings are ]. | |||
| Imagine that a physicist detonates a ] beside him. In almost all ]s, the nuclear explosion will vaporize the physicist. However, there should be a small ] of alternative universes in which the physicist somehow survives (ie. the set of universes which support a "miraculous" survival scenario). The idea behind quantum immortality is that the physicist will remain alive in, and thus able to experience, at least one of the universes in this set, even though these universes form a tiny subset of all possible universes. Over time the physicist would therefore consider himself to be living forever. There are some parallels with this concept in the ]. | |||
| Another example is that provided by ] where a physicist sits in front of a gun which is triggered, or not triggered, by radioactive decay. With each run of the experiment there is a fifty-fifty chance that the gun will be triggered and the physicist will die. If the ] is correct, then the gun will eventually be triggered and the physicist will die. If the ] is correct, then at each run of the experiment the physicist will be split into a world in which he lives and one in which he dies. In the worlds where the physicist dies, he will cease to exist. However, from the point of view of the physicist, the experiment will continue running without his ceasing to exist, because at each branch, he will only be able to observe the result in the world in which he survives, and if many-worlds is correct, the physicist will notice that he never seems to die therefore proving himself to be immortal, or at least according to quantum immortality. | |||
| Proponents point out that while it is highly speculative, quantum immortality violates no known laws of ]. | |||
| Although quantum immortality is motivated by the ] thought experiment, ], one of the inventors of this experiment, has stated that he does not believe that quantum immortality is a consequence of his work. He argues that under any sort of normal conditions, before someone dies they undergo a period of diminishment of consciousness, a non-quantum decline (which can be anywhere from seconds to minutes to years), and hence there is no way of establishing a continuous existence from this world to an alternate one in which the person continues to exist. | |||
| ==Fictional depictions== | |||
| The ] novel '']'' explores topics related to quantum immortality. | |||
| Other science fiction stories exploring these and related ideas include "]" by ], and "]" by ]. | |||
| The film loosely explores quantum immortality. | |||
| ==See also== | |||
| * ] | |||
| * ] | |||
| * ] | |||
| * ] | |||
| * ] | |||
| ==External links== | |||
| * by ] | |||
| ] | |||
| ] | |||
| ] | |||
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