Superradiance from hydrodynamic vortices: A numerical study

Journal Article · Wed Mar 15 00:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20786962

Federici, F; Tosi, M P ^[1]; Cherubini, C ^[2]; Succi, S ^[3]

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1. NEST-INFM and Classe di Scienze, Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy)
2. Facolta di Ingegneria, Universita Campus Biomedico di Roma, Via Longoni 83, 00155 Rome (Italy)
3. Istituto per le Applicazioni del Calcolo, CNR, Viale del Policlinico 137, 00161 Rome (Italy)

The scattering of sound-wave perturbations from vortex excitations in hydrodynamic systems with typical Bose-Einstein-condensate (BEC) parameters is investigated by numerical integration of the associated Klein-Gordon equation. The simulations indicate that at sufficiently high angular speeds, in the perturbative limit where back-reaction effects can be neglected, sound wave packets can extract a sizable fraction of the vortex energy through a mechanism of superradiant scattering. It is conjectured that this superradiant regime may be detectable in BEC experiments.

• OSTI ID: 20786962
• Journal Information: Physical Review. A, Vol. 73, Issue 3; Other Information: DOI: 10.1103/PhysRevA.73.033604; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BLACK HOLES
BOSE-EINSTEIN CONDENSATION
COMPUTERIZED SIMULATION
DISTURBANCES
EXCITATION
HYDRODYNAMICS
KLEIN-GORDON EQUATION
NUMERICAL ANALYSIS
SCATTERING
SOUND WAVES
SUPERRADIANCE
VORTICES