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arXiv 1408.0954nlin.SIhep-th
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一类具有自诱导PT-对称势的非局部非线性Schrodinger方程的对称性与精确解

On Symmetries and Exact Solutions of a Class of Non-local Non-linear Schrodinger Equations with Self-induced PT-symmetric Potential

Debdeep Sinha, Pijush K. Ghosh

摘要:

考虑了一类具有时空调制系数的非线性相互作用项以及限制和/或损失增益项的非定域非线性薛定谔方程(NLSE).这是最近推出的可积的非局部NLSE与自诱导的潜力是PT对称的相应的固定问题的推广。利用相似变换方法,得到了非均匀和/或非自治非局域非线性最小二乘方程的精确孤子解,并举例说明了该方法。结果表明,只有那些变换后的空间坐标在原空间坐标的奇偶变换下为奇数的变换才是允许的。证明了无外势的非定域NLSE及其d+1维推广,包含d+1维Schrodinger群的所有对称性.与时间平移、膨胀和特殊保角变换相联系的守恒Noether荷尽管是非厄米的,但仍是实值的。最后,研究了系统具有O(2,1)共形对称性的特殊情况下,不同时刻的动力学,并精确描述了波包的“伪宽度”随时间的演化.

英文摘要:

A class of non-local non-linear Schrodinger equations(NLSE) is considered in an external potential with space-time modulated coefficient of the nonlinear interaction term as well as confining and/or loss-gain terms. This is a generalization of a recently introduced integrable non-local NLSE with self-induced potential that is PT symmetric in the corresponding stationary problem. Exact soliton solutions are obtained for the inhomogeneous and/or non-autonomous non-local NLSE by using similarity transformation and the method is illustrated with a few examples. It is found that only those transformations are allowed for which the transformed spatial coordinate is odd under the parity transformation of the original one. It is shown that the non-local NLSE without the external potential and a d+1 dimensional generalization of it, admits all the symmetries of the d+1 dimensional Schrodinger group. The conserved Noether charges associated with the time-translation, dilatation and special conformal transformation are shown to be real-valued in spite of being non-hermitian. Finally, dynamics of different moments are studied with an exact description of the time-evolution of the "pseudo-width" of the wave-packet for the special case when the system admits a O(2,1) conformal symmetry.

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