Nonlinear stability problems for the sine-Gordon equation

Abstract
Two stability problems for the nonlinear sine‐Gordon equation are studied. The stability of a class of time independent (static) solutions is studied using linear dynamic stability theory. An asymptotic approximation of the nonlinear transient response to small disturbances of an unstable static state is obtained by the two time method. Interpretations of the results are given for the continuous pendulum problem and for the Josephson tunnel junction. A proof of the validity of the asymptotic approximation is given.

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