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## Doubly-special relativityDoubly-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. ## External references- Giovanni Amelino-Camelia, "Doubly-Special Relativity: First Results and Key Open Problems."
*Int. J. Mod. Phys.*D11 (2002) 1643. Online copy at http://arxiv.org/abs/gr-qc/0210063 - Giovanni Amelino-Camelia,
*Doubly-Special Relativity.*' http://lanl.arxiv.org/abs/gr-qc/0207049 -- a non-technical review
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