title: Kelvin waves of quantized vortex lines in trapped Bose-Einstein condensates.
abstract: We have theoretically investigated Kelvin waves of quantized vortex lines in trapped Bose-Einstein condensates. Counterrotating perturbation induces an elliptical instability to the initially straight vortex line, driven by a parametric resonance between a quadrupole mode and a pair of Kelvin modes of opposite momenta. Subsequently, Kelvin waves rapidly decay to longer wavelengths emitting sound waves in the process. We present a modified Kelvin wave dispersion relation for trapped superfluids and propose a simple method to excite Kelvin waves of specific wave number.
authors.affiliation: Department of Physics, Okayama University, Okayama 700-8530, Japan.
authors.forename: T P
authors.initials: TP
authors.lastname: Simula
authors.forename: T
authors.initials: T
authors.lastname: Mizushima
authors.forename: K
authors.initials: K
authors.lastname: Machida