, Volume 322, Issue 3, pp 603-621

Nonrelativistic limit in the energy space for nonlinear Klein-Gordon equations

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We study the nonrelativistic limit of the Cauchy problem for the nonlinear Klein-Gordon equation and prove that any finite energy solution converges to the corresponding solution of the nonlinear Schrödinger equation in the energy space, after the infinite oscillation in time is removed. We also derive the optimal rate of convergence in \(L^2\) .

Received: 13 July 2000 / Published online: 1 February 2002