Elastic wavepackets crossing a space-time interface
Classical Physics
2025-01-07 v2
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 non-conservation 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 spatio-temporal interface traveling along the strip, we confirm theoretical predictions regarding observed shifts when a wave packet crosses this interface.
Cite
@article{arxiv.2406.15100,
title = {Elastic wavepackets crossing a space-time interface},
author = {Alexandre Delory and Claire Prada and Maxime Lanoy and Antonin Eddi and Mathias Fink and Fabrice Lemoult},
journal= {arXiv preprint arXiv:2406.15100},
year = {2025}
}
Comments
6 pages, 3 figures