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Photon acceleration in vacuum

Mendonça, J.T. and Marklund, M. and Shukla, P.K. and Brodin, G. (2006) Photon acceleration in vacuum. Physics Letters A, 359 (6). pp. 700-704. ISSN 0375-9601

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A new process associated with the nonlinear optical properties of the electromagnetic vacuum, as predicted by quantum electrodynamics, is described. This can be called photon acceleration in vacuum, and corresponds to the frequency shift that takes place when a given test photon interacts with an intense beam of background radiation.