Instability of nonlinear bound states

@article{Shatah1985InstabilityON,
  title={Instability of nonlinear bound states},
  author={Jalal Shatah and Walter Alexander Strauss},
  journal={Communications in Mathematical Physics},
  year={1985},
  volume={100},
  pages={173-190}
}
We establish a sharp instability theorem for the bound states of lowest energy of the nonlinear Klein-Gordon equation,utt−◃u+f(u)=0, and the nonlinear Schrödinger equation, −iut−◃u+f(u)=0. 

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