Elastic Wave Packets Crossing a Space-Time Interface
Alexandre Delory1,2, Claire Prada1, Maxime Lanoy3
1Institut Langevin, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France.
Abstract:
The interaction between waves and evolving media challenges traditional conservation laws. We experimentally investigate the behavior of elastic wave packets crossing a moving interface that separates two media with distinct propagation properties, observing the noninvariance of wavelength and frequency. Our experimental setup employs an elastic strip whose local stretching can be dynamically altered by pulling one end at a constant velocity. By demonstrating that this dynamic configuration creates a spatiotemporal interface traveling along the strip, we confirm theoretical predictions regarding observed shifts when a wave packet crosses this interface.
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