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arXiv 0812.1825math.AP
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索伯列夫空间中色散广义Benjamin-Ono方程的局部适定性

Local Well-posedness for dispersion generalized Benjamin-Ono equations in Sobolev spaces

Zihua Guo

摘要:

证明了色散广义Benjamin-Ono方程\[\partial_t u+|\partial_x|^{1+α}\partial_x u+uu_x=0,\ u(x,0)=u_0(x),\]的Cauchy问题在索伯列夫空间$H^s$中是局部适定的,如果$s>1-α$.新的成分是,我们开发的方法Ionescu,凯尼格和Tataru \cite{IKT}接近问题的扰动的方式,尽管不适定性结果Molinet,Saut和Tzvetkovin \cite{MST}。此外,作为一个双产品,我们证明了,如果$0<α\leq 1$相应的修改方程(与非线性$\pm uuu_x$)是局部适定的$H^s$为$s\geq 1/2-α/4$。

英文摘要:

We prove that the Cauchy problem for the dispersion generalized Benjamin-Ono equation \[\partial_t u+|\partial_x|^{1+α}\partial_x u+uu_x=0,\ u(x,0)=u_0(x),\] is locally well-posed in the Sobolev spaces $H^s$ for $s>1-α$ if $0\leq α\leq 1$. The new ingredient is that we develop the methods of Ionescu, Kenig and Tataru \cite{IKT} to approach the problem in a less perturbative way, in spite of the ill-posedness results of Molinet, Saut and Tzvetkovin \cite{MST}. Moreover, as a bi-product we prove that if $0<α\leq 1$ the corresponding modified equation (with the nonlinearity $\pm uuu_x$) is locally well-posed in $H^s$ for $s\geq 1/2-α/4$.

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