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• W2950304057 startingPage "781" @default.
• W2950304057 abstract "Lamb waves are trapped acoustic-gravity waves that propagate energy over great distances along a solid boundary in density-stratified, compressible fluids1,2. They constitute useful indicators of explosions in planetary atmospheres3,4. When the density stratification exceeds a threshold, or when the impermeability condition at the boundary is relaxed, atmospheric Lamb waves suddenly disappear5. Here, we use topological arguments to predict the possible existence of new trapped Lamb-like waves in the absence of a solid boundary, depending on the stratification profile. The topological origin of the Lamb-like waves is emphasized by relating their existence to two-band crossing points carrying opposite Chern numbers. The existence of these band crossings coincides with a restoration of the vertical mirror symmetry that is in general broken by gravity. From this perspective, Lamb-like waves also bear strong similarities with boundary modes encountered in the quantum valley Hall effect6–8 and its classical analogues9–11. Our study shows that the presence of Lamb-like waves encodes essential information on the underlying stratification profile in astrophysical and geophysical flows, which is often poorly constrained by observations. A prediction of the existence of trapped acoustic-gravity waves in stratified fluids provides a platform for probing topological phenomena in the lab—with possible implications for astrophysical and geophysical flows." @default.
• W2950304057 created "2019-06-27" @default.
• W2950304057 creator A5039607215 @default.
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• W2950304057 date "2019-06-24" @default.
• W2950304057 modified "2023-10-14" @default.
• W2950304057 title "Topological transition in stratified fluids" @default.
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• W2950304057 doi "https://doi.org/10.1038/s41567-019-0561-1" @default.
• W2950304057 hasPublicationYear "2019" @default.
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