Monday, March 19, 2012

1203.3233 (Andrew Comech)

Weak attractor of the Klein-Gordon field in discrete space-time
interacting with a nonlinear oscillator

Andrew Comech
We consider the $\mathbf{U}(1)$-invariant nonlinear Klein-Gordon equation in discrete space and discrete time, which is the discretization of the nonlinear continuous Klein-Gordon equation. To obtain this equation, we use the finite-difference scheme of Strauss-Vazquez. We prove that each finite energy solution converges as $\ttd\to\pm\infty$ to the finite-dimensional set of all multifrequency solitary wave solutions of the form $\phi_1 e^{-i\omega t}$, $\phi_1 e^{-i\omega t}+\phi_2 e^{-i(\omega+\pi)t}$, $\phi_1 e^{-i\omega t}+\phi_2 e^{-i(\omega+\pi)t}+\phi_3 e^{-i\omega' t}+\phi_4 e^{-i(\omega'+\pi)t}$, $t\in\mathbb{Z}$, where $\phi_k\in l^2(\mathbb{Z}^n)$, $1\le k\le 4$, and the frequencies $\omega$ and $\omega'$ are real-valued. The components of the solitary manifold corresponding to the solitary waves of the first two types are generically two-dimensional, while the component corresponding to the last type is generically four-dimensional. The attraction to the set of solitary waves is caused by the nonlinear energy transfer from lower harmonics to the continuous spectrum and subsequent radiation. For the proof, we develop the well-posedness for the nonlinear wave equation in discrete space-time, apply the technique of quasimeasures, and also obtain the version of the Titchmarsh convolution theorem for distributions on the circle.
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