Geometry-controlled zeros of resonant Kelvin-wave conversion in four spatial dimensions

@misc{yang2026geometrycontrolled,
  title = {{Geometry-controlled zeros of resonant Kelvin-wave conversion in four spatial dimensions}},
  author = {Wei-can Yang and Xiang-dong Xu and Cheng Li and Ke-yu Lu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29218},
  eprint = {2610.29218},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29218},
}

TY  - UNPB
TI  - Geometry-controlled zeros of resonant Kelvin-wave conversion in four spatial dimensions
AU  - Wei-can Yang
AU  - Xiang-dong Xu
AU  - Cheng Li
AU  - Ke-yu Lu
PY  - 2026
DA  - 2026/10/28
PB  - arXiv
DO  - 10.48550/arxiv.2610.29218
UR  - https://arxiv.org/abs/2610.29218
AB  - 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_*≃1.469. 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.
ER  -