The group velocity is not always identical with the velocity of signal propagation In further paragraphs, we’ll see that friction an before examining the bases of superluminal dynamics, let’s briefly mention important flaws that make both the theory of relativity and quantum theory useless. Another prominent staple of science fiction is the concept of time travel5. “einstein once called the speed of light the universe’s speed limit, he claimed that traveling faster than the speed of light would violate the causality principle.”1
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