Normalized solutions for a coupled Schrödinger system
Normalized solutions for a coupled Schrödinger system
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耦合薛定谔系统的归一化解
DOI:
10.1007/s00208-020-02000-w
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发表时间:
2019-08
影响因子:
1.4
通讯作者:
Wenming Zou
中科院分区:
文献类型:
--
作者:
Thomas Bartsch;Xuexiu Zhong;Wenming Zou
In the present paper, we prove the existence of solutions $(\la_1,\la_2,u,v)\in\R^2\times H^1(\R^3,\R^2)$ to systems of coupled Schr\"odinger equations.$$.\bcs.-\De u+\la_1u=\mu_1 u^3+\be uv^2\quad &\hbox{in}\;\R^3\\.-\De v+\la_2v=\mu_2 v^3+\be u^2v\quad&\hbox{in}\;\R^3\\.u,v>0&\hbox{in}\;\R^3.\ecs.$$.satisfying the normalization constraint.$.\displaystyle\int_{\R^3}u^2=a^2\quad\hbox{and}\;\int_{\R^3}v^2=b^2,.$.which appear in binary mixtures of Bose-Einstein condensates or in nonlinear optics..The parameters $\mu_1,\mu_2,\be>0$ are prescribed as are the masses $a,b>0$. The system has been considered mostly in the case of fixed frequencies $\la_1,\la_2$. When the masses are prescribed, the standard approach to this problem is variational with $\la_1,\la_2$ appearing as Lagrange multipliers. Here we present a new approach based on the fixed point index in cones, bifurcation theory, and the continuation method. We obtain the existence of normalized solutions for any given $a,b>0$ for $\be$ in a large range. We also have a result about the nonexistence of positive solutions which shows that our existence theorem is almost optimal. Especially, if $\mu_1=\mu_2$ we prove that normalized solutions exist for all $\be>0$ and all $a,b>0$.
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影响因子:
2.4
作者:
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通讯作者:
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影响因子:
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DOI:
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发表时间:
2011
影响因子:
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