Resonant solitons from the $3\times 3$ operator

Details Resonant solitons from the $3\times 3$ operator Resonant solitons from the $3\times 3$ operator

2011-06-20

arxiv.org/abs/1106.3943v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

24 pages, no figures

Scientific paper

Resonant solitons of the $3\times 3$ operator are studied. The scattering data of this operator contains four transmission coefficients, two in each half complex $\zeta$-plane, where $\zeta$ is the spectral parameter. For anti-hermitian symmetry of the potential, the two transmission coefficients in the lower half plane (LHP) become equal to the complex conjugates of those in the upper half plane (UHP). The bound state scattering data for this operator consists in part of the zeros of these two transmission coefficients. Of particular interest is that class of soliton solutions when the two transmission coefficients have exactly equal eigenvalues, which gives rist to "resonant solitons". They arise from a bifurcation which is caused by the algebraic structure of the $3\times 3$ scattering matrix. We detail the asymptotics of this solution, showing that the latter contains the well known parametric interactions of "up-conversion" and "down-conversion". Lastly, we explain how this equality of eigenvalues in different transmission coefficients can be seen to be a nonlinear resonance condition.

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