AKNS hierarchy, Darboux transformation and conservation laws of the 1D nonautonomous nonlinear Schrödinger equations

Journal of Mathematical Physics - Tập 52 Số 4 - 2011
Dun Zhao1,2, Yujuan Zhang1, Wei-Wei Lou1, Hong‐Gang Luo2,3
1Lanzhou University 1 School of Mathematics and Statistics, , Lanzhou 730000, China
2Lanzhou University 2 Center for Interdisciplinary Studies, , Lanzhou 730000, China
3Lanzhou University 3 Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, , Lanzhou 730000, China

Tóm tắt

By constructing nonisospectral Ablowitz–Kaup–Newell–Segur (AKNS) hierarchy, we investigate the nonautonomous nonlinear Schrödinger (NLS) equations which have been used to describe the Feshbach resonance management in matter-wave solitons in Bose–Einstein condensate and the dispersion and nonlinearity managements for optical solitons. It is found that these equations are some special cases of a new integrable model of nonlocal nonautonomous NLS equations. Based on the Lax pairs, the Darboux transformation and conservation laws are explored. It is shown that the local external potentials would break down the classical infinite number of conservation laws. The result indicates that the integrability of the nonautonomous NLS systems may be nontrivial in comparison to the conventional concept of integrability in the canonical case.

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