Abstract
We consider the sine-Gordon equation in laboratory coordinates with both x and t in [0, ∞). We assume that u(x, 0), ut(x, 0), u(0, t) are given, and that they satisfy u(x, 0)→2πq, ut(x, 0)→0, for large x, u(0, t)→2πp for large t, where q, p are integers. We also assume that ux(x, 0), ut(x, 0), ut(0, t), u(0, t)-2πp, u(x, 0)-2πq ε L2. We show that the solution of this initial-boundary value problem can be reduced to solving a linear integral equation which is always solvable. The asymptotic analysis of this integral equation for large t shows how the boundary conditions can generate solitons.
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The authors dedicate this paper to the memory of M. C. Polivanov
Department of Mathematics and Computer Science; Institute for Nonlinear Studies, Clarkson University, Postdam, New York. Published in Teoreticheskaya i Matematicheskaya Fizika, Vol. 92, No. 3, pp. 387–403, September, 1992.
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Fokas, A.S., Its, A.R. An initial-boundary value problem for the sine-Gordon equation in laboratory coordinates. Theor Math Phys 92, 964–978 (1992). https://doi.org/10.1007/BF01017074
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DOI: https://doi.org/10.1007/BF01017074