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arXiv 0705.0482math.APmath-phmath.MP
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一类耦合KdV方程组的局部适定性

On The Local Well-Posedness for Some Systems of Coupled KdV Equations

Borys Alvarez-Samaniego, Xavier Carvajal

摘要:

利用Kenig,Ponce和Vega的理论,证明了Hirota-Satsuma系统在Sobolev空间$H^s(\mathbb{R}) \times H^{s}(\mathbb{R})$中的局部适定性.引入Bourgain型空间$X_{s,b}^a$ for $a\not =0$,$s,b \in \mathbb{R}$,通过建立新的混合双线性估计,得到了Gear-Grimshaw系统在$H^s(\mathbb{R})\times H^s(\mathbb{R})$ for $s>-3/4$中的局部适定性,该估计涉及两个Bourgain型空间$X_{s,b}^{-α_-}$和$X_{s,b}^{-α_+}$,分别适用于$\partial_t+α_-\partial_x^3$和$\partial_t+α_+\partial_x^3$,其中$|α_+|=|α_-|\not = 0$ .

英文摘要:

Using the theory developed by Kenig, Ponce, and Vega, we prove that the Hirota-Satsuma system is locally well-posed in Sobolev spaces $H^s(\mathbb{R}) \times H^{s}(\mathbb{R})$ for $3/4<s\le1$. We introduce some Bourgain-type spaces $X_{s,b}^a$ for $a\not =0$, $s,b \in \mathbb{R}$ to obtain local well-posedness for the Gear-Grimshaw system in $H^s(\mathbb{R})\times H^s(\mathbb{R})$ for $s>-3/4$, by establishing new mixed-bilinear estimates involving the two Bourgain-type spaces $X_{s,b}^{-α_-}$ and $X_{s,b}^{-α_+}$ adapted to $\partial_t+α_-\partial_x^3$ and $\partial_t+α_+\partial_x^3$ respectively, where $|α_+|=|α_-|\not = 0$.

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