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arXiv 2407.10258math.AP
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二维NLS方程归一化解的质量混合情形

The mass-mixed case for normalized solutions to NLS equations in dimension two

Daniele Cassani, Ling Huang, Cristina Tarsi, Xuexiu Zhong

AI总结:

本文研究二维半线性薛定谔方程的正归一化解,针对零点$L^2$-次临界、无穷远指数型临界增长的质量混合情形,证明小质量下存在局部极小和山路型两个正解,并分析零质量极限的渐近行为。

摘要:

我们研究如下半线性薛定谔方程的正归一化解 $(u,λ)\in H^1(\n2)\times\n$:$$ -Δu+λu=f(u), \text{在}\r^2中, $$ 满足质量约束$$\nt_{\r^2}|u|^2 dx=c^2\tag{1}$$。我们关注所谓的质量混合情形,即$f$在零点处具有$L^2$-次临界增长,在无穷远处具有临界增长,在二维空间中这种增长呈指数速率。在温和条件下,我们证明当给定质量足够小时,存在两个正归一化解:一个是局部极小解,另一个是山路型解。我们还研究了当$c\to 0^+$即趋近零质量情形时解的渐近行为。

英文摘要:

\noindent We are concerned with positive normalized solutions $(u,λ)\in H^1(\mathbb{R}^2)\times\mathbb{R}$ to the following semi-linear Schrödinger equations $$ -Δu+λu=f(u), \quad\text{in}~\mathbb{R}^2, $$ satisfying the mass constraint $$\int_{\mathbb{R}^2}|u|^2\, dx=c^2\ .$$ We are interested in the so-called mass mixed case in which $f$ has $L^2$-subcritical growth at zero and critical growth at infinity, which in dimension two turns out to be of exponential rate. Under mild conditions, we establish the existence of two positive normalized solutions provided the prescribed mass is sufficiently small: one is a local minimizer and the second one is of mountain pass type. We also investigate the asymptotic behavior of solutions approaching the zero mass case, namely when $c\to 0^+$.

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