How shock waves travel through a superfluid provides clues to understanding the deeper nature of Bose–Einstein condensation. An optical analogue that behaves as a pure superfluid could tell us what these clues mean.
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Hau, L. Nonlinear optics: Shocking superfluids. Nature Phys 3, 13–14 (2007). https://doi.org/10.1038/nphys498
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DOI: https://doi.org/10.1038/nphys498
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