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arXiv 0811.3729math-phmath.MP
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非线性薛定谔-亥姆霍兹方程自聚焦的调制理论

Modulation theory for self-focusing in the nonlinear Schrödinger-Helmholtz equation

Yanping Cao, Ziad H. Musslimani, Edriss S. Titi

摘要:

提出了具有$2σ$非线性幂的$N$空间维中的非线性Schrödinger-Helmholtz(SH)方程,作为经典非线性Schrödinger(NLS)方程的正则化.结果表明,SH方程具有更大的区域($1\leσ<\frac{4}{N}$)的整体存在性和唯一性相比,经典的NLS($0<σ<\frac{2}{N}$)。在薛定谔-亥姆霍兹方程被视为经典NLS方程的扰动系统的极限情况下,我们将调制理论应用于经典临界情况($σ=1,\:N=2$),并表明正则化防止了NLS方程奇异性的形成。我们的理论结果得到了数值模拟的支持

英文摘要:

The nonlinear Schrödinger-Helmholtz (SH) equation in $N$ space dimensions with $2σ$ nonlinear power was proposed as a regularization of the classical nonlinear Schrödinger (NLS) equation. It was shown that the SH equation has a larger regime ($1\leσ<\frac{4}{N}$) of global existence and uniqueness of solutions compared to that of the classical NLS ($0<σ<\frac{2}{N}$). In the limiting case where the Schrödinger-Helmholtz equation is viewed as a perturbed system of the classical NLS equation, we apply modulation theory to the classical critical case ($σ=1,\:N=2$) and show that the regularization prevents the formation of singularities of the NLS equation. Our theoretical results are supported by numerical simulations

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