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: Time travel: A theoretical physicist explains the paradoxes of going to the past or future #IndiaNEWS Time travel makes regular appearances in popular culture, with innumerable time travel storylines
Time travel: A theoretical physicist explains the paradoxes of going to the past or future #IndiaNEWS
Time travel makes regular appearances in popular culture, with innumerable time travel storylines in movies, television and literature. But it is a surprisingly old idea: one can argue that the Greek tragedy Oedipus Rex, written by Sophocles over 2,500 years ago, is the first time travel story.But is time travel in fact possible? Given the popularity of the concept, this is a legitimate question. As a theoretical physicist, I find that there are several possible answers to this question, not all of which are contradictory.The simplest answer is that time travel cannot be possible because if it was, we would already be doing it. One can argue that it is forbidden by the laws of physics, like the second law of thermodynamics or relativity. There are also technical challenges: it might be possible but would involve vast amounts of energy.There is also the matter of time-travel paradoxes. We can – hypothetically – resolve these if free will is an illusion, if many worlds exist or if the past can only be witnessed but not experienced. Perhaps time travel is impossible simply because time must flow in a linear manner and we have no control over it, or perhaps time is an illusion and time travel is irrelevant.Laws of physicsSince Albert...Read more
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