Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In physics, X-waves are localized solutions of the wave equation that travel at a constant velocity along a given direction. X-waves can be sound, electromagnetic, or gravitational waves. They are built as a non-monochromatic superposition of Bessel beams. X-waves carry infinite energy and travel superluminally (for electromagnetic waves). Finite energy realizations have... Mehr
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