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Doubly-special relativity

Doubly-Special Relativity is a new theory of special relativity first postulated in a paper by Giovanni Amelino-Camelia[?]. In this theory, he postulates that in addition to the speed of light, a characteristic energy scale based on the Planck scale should remain invariant under relativistic transformations.

One of the motivations for this work is the observation of high-energy cosmic rays that appear to violate the Greisen-Zatsepin-Kuzmin limit: the so-called GZK paradox.

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