2018/09/30 by Carolina L. Benone, Luís C. B. Crispino, Carlos A. R. Herdeiro +2 · 8 citations
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Cosmology and Gravitation Theories #Environmental science #Geology #Quantum Electrodynamics and Casimir Effect #gr-qc
paper · pdf · doi:10.1016/j.physletb.2018.10.030
published in Physics Letters B 786, 442-447 (Elsevier BV) · v2: 7 pages, 4 figures. Accepted for publication in Physics Letters B
arxiv created 2018/10/16 · openalex publication_date 2018/10/20 · arxiv updated 2018/11/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The existence of stationary bound states for the hydrodynamic velocity field between two concentric cylinders is established. We argue that rotational motion, together with a trapping mechanism for the associated field, is sufficient to mitigate energy dissipation between the cylinders, thus allowing the existence of infinitely long lived modes, which we dub stationary clouds . We demonstrate the existence of such stationary clouds for sound and surface waves when the fluid is static and the internal cylinder rotates with constant angular velocity Ω. These setups provide a unique opportunity for the first experimental observation of synchronized stationary clouds. As in the case of bosonic fields around rotating black holes and black hole analogues, the existence of these clouds relies on a synchronization condition between Ω and the angular phase velocity of the cloud.