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Superluminal localized structures of electromagnetic radiationa S I Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 199034, Russian Federation b ITMO University, Kronverksky Pr. 49, bldg. A, St. Petersburg, 197101, Russian Federation This paper analyzes localized invariable-form structures of electromagnetic radiation in vacuum and soliton-like light structures traveling superluminally in a nonlinear medium. Both types of structures are concluded to be unstable to small perturbations.
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