Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2011-10-26
Physics
Condensed Matter
Other Condensed Matter
4 pages, 2 figures
Scientific paper
Employing Unruh's analogy to gravity, we study sound propagation in stationary and locally irrotational vortex flows where the circulation is wound around a long (rotating) cylinder. Apart from the usual scattering solutions, we find anomalous modes which are bound to the vicinity of the cylinder and propagate along its axis -- similar to whispering gallery modes. For supersonic flow velocities (corresponding to an effective ergoregion), these modes can even have zero frequency. Thus they should be relevant for the question of stability or instability of this set-up.
Marecki Piotr
Schützhold Ralf
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