Mathematics – Analysis of PDEs
Scientific paper
2011-07-19
Mathematics
Analysis of PDEs
16 pages
Scientific paper
We consider a Hamiltonian systems which is invariant under a one-parameter
unitary group. We give a criterion for the stability and instability of bound
states for the degenerate case. We apply our theorem to the single power
nonlinear Klein-Gordon equation and the double power nonlinear Schr\"odinger
equation.
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