Year: 2026
Type: preprint
Abstract: We show that geometry can suppress resonant four-wave conversion of Kelvin waves on a vortex surface in four spatial dimensions. Perpendicular incoming waves eliminate the entire local-area contribution, exposing a finite interaction mediated by the surrounding fluid. Reflection allows the incoming wave-number ratio to vary at exact resonance, revealing a sign-changing zero of this fluid coupling at \(λ_*\simeq1.469\). Uniform matching of the Gross--Pitaevskii (GP) four-wave coupling to the fluid result establishes microscopic zeros that approach this ratio at long wavelengths. Numerical calculations also show the corresponding sign change. Independent calculations in separate resonant geometries connect the coupling sign to the phase of coherently generated waves and the frequency ordering of reflection-even and reflection-odd modes. The surrounding flow thus determines whether an exactly resonant conversion channel is present at four-wave order.
Source: arXiv (Cornell University)
Authors: Yang, Wei-can, Xu, Xiang-dong, Li, Cheng, Lu, Ke-yu
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223248931