Corpus ID: 237635099

An alternative proof of modulation instability of Stokes waves in deep water

  title={An alternative proof of modulation instability of Stokes waves in deep water},
  author={Zhao Yang},
  • Zhao Yang
  • Published 24 September 2021
  • Mathematics
We generalize the periodic Evans function approach recently used to study the spectral stability of Stokes wave and gravity-capillary (including Wilton ripples) in water of finite depth to study spectral stability of Stokes waves in water of infinite depth. We prove waves of sufficiently small amplitude are always low-frequency unstable regardless of the wave number and gravity, giving an alternative proof for the Benjamin-Feir modulational instability in the infinite depth case. Here, the… Expand

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