Archive for Rational Mechanics and Analysis

, Volume 185, Issue 1, pp 105–142 | Cite as

Global Attractor for a Nonlinear Oscillator Coupled to the Klein–Gordon Field

  • Alexander Komech
  • Andrew KomechEmail author


The long-time asymptotics is analyzed for all finite energy solutions to a model \(\mathbf{U}(1)\)-invariant nonlinear Klein–Gordon equation in one dimension, with the nonlinearity concentrated at a single point: each finite energy solution converges as t→ ± ∞ to the set of all “nonlinear eigenfunctions” of the form ψ(x)eiω t. The global attraction is caused by the nonlinear energy transfer from lower harmonics to the continuous spectrum and subsequent dispersive radiation.

We justify this mechanism by the following novel strategy based on inflation of spectrum by the nonlinearity. We show that any omega-limit trajectory has the time spectrum in the spectral gap [ − m,m] and satisfies the original equation. This equation implies the key spectral inclusion for spectrum of the nonlinear term. Then the application of the Titchmarsh convolution theorem reduces the spectrum of each omega-limit trajectory to a single harmonic \(\omega\in[-m,m]\).

The research is inspired by Bohr’s postulate on quantum transitions and Schrödinger’s identification of the quantum stationary states to the nonlinear eigenfunctions of the coupled \(\mathbf{U}(1)\)-invariant Maxwell–Schrödinger and Maxwell–Dirac equations.


Cauchy Problem Solitary Wave Global Attractor Gordon Equation Nonlinear Wave Equation 


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Faculty of MathematicsWienAustria
  2. 2.Mathematics DepartmentTexas A&M UniversityTexasUSA
  3. 3.On leave from Department of Mechanics and MathematicsMoscow State UniversityMoscowRussia

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