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arXiv 1602.03519math.AP
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临界gKdV方程最小质量爆破解的渐近性

Sharp asymptotics for the minimal mass blow up solution of critical gKdV equation

Vianney Combet, Yvan Martel

摘要:

令$S$是临界广义KdV方程的最小质量爆破解,如Martel,Merle和Raphaël在arXiv:1204.4624中构造的。我们证明了$S$在时间和空间上都是渐近的。令$Q$为(gKdV)的唯一基态,满足$Q"+Q^5=Q$。首先,我们表明,存在普遍的平滑配置文件$Q_k\in\mathcal{S}(\mathbb{R})$($Q_0=Q$)和一个常数$c_0\in\mathbb{R}$,这样,固定在$t=0$和适当的缩放和平移参数的爆破时间,$S$满足,对于任何$m\geqslant 0$,\[ \partial_x^m S(t) - \sum_{k=0}^{[m/2]} \frac 1{t^{\frac 12+m-2k}} Q_k^{(m-k)}\left(\frac{\cdot+ \frac1t}{t}+c_0\right)\to 0\quad \mbox{in}\ L^2 \mbox{as}\ t\downarrow 0. \]第二,我们证明,对于$0<t\ll 1$,$x\leqslant -\frac 1t -1$,\[ S(t,x) \sim - \frac 12 \|Q\|_{L^1} |x|^{-3/2}, \]和相关的界限的衍生物的$S(t)$的任何顺序。我们还证明了$\int_{\mathbb{R}} S(t,x)\,dx=0$ .

英文摘要:

Let $S$ be a minimal mass blow up solution of the critical generalized KdV equation as constructed by Martel, Merle and Raphaël in arXiv:1204.4624. We prove both time and space sharp asymptotics for $S$ close to the blow up time. Let $Q$ be the unique ground state of (gKdV), satisfying $Q"+Q^5=Q$. First, we show that there exist universal smooth profiles $Q_k\in\mathcal{S}(\mathbb{R})$ (with $Q_0=Q$) and a constant $c_0\in\mathbb{R}$ such that, fixing the blow up time at $t=0$ and appropriate scaling and translation parameters, $S$ satisfies, for any $m\geqslant 0$, \[ \partial_x^m S(t) - \sum_{k=0}^{[m/2]} \frac 1{t^{\frac 12+m-2k}} Q_k^{(m-k)}\left(\frac{\cdot+ \frac1t}{t}+c_0\right)\to 0\quad \mbox{in}\ L^2 \mbox{as}\ t\downarrow 0. \] Second, we prove that, for $0<t\ll 1$, $x\leqslant -\frac 1t -1$, \[ S(t,x) \sim - \frac 12 \|Q\|_{L^1} |x|^{-3/2}, \] and related bounds for the derivatives of $S(t)$ of any order. We also prove $\int_{\mathbb{R}} S(t,x)\,dx=0$.

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