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二维广义Zakharov-Kuznetsov方程的局部和整体适定性

Local and global well-posedness for the 2D generalized Zakharov-Kuznetsov equation

Felipe Linares, Ademir Pastor

摘要:

本文讨论了广义Zakharov-Kuznetsov方程的初值问题的适定性问题,即:\{方程 *} \quad \left \{\{array}{lll} { \displaystyle u_t+ \partial_x Δu+u^ku_x = 0,} \qquad(x,y)\in \mathbb{R}^2,\,t>0,{ \displaystyle u(x,y,0)=u_0(x,y)}. \{array} \right。\{equation*}对于$2\leq k \leq 7$,上述IVP对于$H^s(\mathbb{R}^2)$、$s>3/4$中的数据显示为局部适定。对于$k\geq8$,局部适定性被证明对$H^s(\mathbb{R}^2)$,$s>s_k$中的数据成立,其中$s_k=1-3/(2k-4)$。此外,对于$k\geq3$,若$u_0\in H^1(\mathbb{R}^2)$且满足$\|u_0\|_{H^1}\ll1$,则证明解在$H^1(\mathbb{R}^2)$中是全局的.对于$k=2$,若$u_0\in H^s(\mathbb{R}^2)$,$s>53/63$,和满足$\|u_0\|_{L^2}<\sqrt3 \, \|ϕ\|_{L^2}$,其中$ϕ$是相应的基态解,则证明了解在$H^s(\mathbb{R}^2)$中是全局的.

英文摘要:

This paper addresses well-posedness issues for the initial value problem (IVP) associated with the generalized Zakharov-Kuznetsov equation, namely, \{equation*} \quad \left\{\{array}{lll} {\displaystyle u_t+\partial_x Δu+u^ku_x = 0,}\qquad (x,y) \in \mathbb{R}^2, \,\,\,\, t>0, {\displaystyle u(x,y,0)=u_0(x,y)}. \{array} \right. \{equation*} For $2\leq k \leq 7$, the IVP above is shown to be locally well-posed for data in $H^s(\mathbb{R}^2)$, $s>3/4$. For $k\geq8$, local well-posedness is shown to hold for data in $H^s(\mathbb{R}^2)$, $s>s_k$, where $s_k=1-3/(2k-4)$. Furthermore, for $k\geq3$, if $u_0\in H^1(\mathbb{R}^2)$ and satisfies $\|u_0\|_{H^1}\ll1$, then the solution is shown to be global in $H^1(\mathbb{R}^2)$. For $k=2$, if $u_0\in H^s(\mathbb{R}^2)$, $s>53/63$, and satisfies $\|u_0\|_{L^2}<\sqrt3 \, \|ϕ\|_{L^2}$, where $ϕ$ is the corresponding ground state solution, then the solution is shown to be global in $H^s(\mathbb{R}^2)$.

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