Mathematics – Analysis of PDEs
Scientific paper
2009-10-23
Mathematics
Analysis of PDEs
26 pages
Scientific paper
We study the initial value problem of the quadratic nonlinear Schr\"odinger equation $$ iu_t+u_{xx}=u\bar{u}, $$ where $u:\R\times \R\to \C$. We prove that it's locally well-posed in $H^s(\R)$ when $s\geq -\dfrac{1}{4}$ and ill-posed when $s< -\dfrac{1}{4}$, which improve the previous work in \cite{KPV}. Moreover, we consider the problem in the following space, $$ H^{s,a}(\R)={u:\|u\|_{H^{s,a}}\triangleq (\displaystyle\int (|\xi|^s\chi_{\{|\xi|>1\}}+|\xi|^a\chi_{\{|\xi|\leq 1\}})^2|\hat{u}(\xi)|^2 d\xi)^{{1/2}}<\infty} $$ for $s\leq 0, a\geq 0$. We establish the local well-posedness in $H^{s,a}(\R)$ when $s\geq -\dfrac{1}{4}-\dfrac{1}{2}a$ and $a<\dfrac{1}{2}$. Also we prove that it's ill-posed in $H^{s,a}(\R)$ when $s<-\dfrac{1}{4}-\dfrac{1}{2}a$ or $a>\dfrac{1}{2}$. It remains the cases on the line segment: $a=\dfrac{1}{2}$, $-\dfrac{1}{2}\leq s\leq 0$ open in this paper.
Li Yongsheng
Wu Yifei
No associations
LandOfFree
On a quadratic nonlinear Schrödinger equation: sharp well-posedness and ill-posedness does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On a quadratic nonlinear Schrödinger equation: sharp well-posedness and ill-posedness, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On a quadratic nonlinear Schrödinger equation: sharp well-posedness and ill-posedness will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-423851