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arXiv 1003.5707math.AP
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实数轴上非线性 Schrödinger 方程解的高 Sobolev 范数增长界

Bounds on the growth of high Sobolev norms of solutions to Nonlinear Schrodinger Equations on $\mathbb{R}$

Vedran Sohinger

AI总结:

本文利用频率分解及改进的 Strichartz 估计,研究实轴上三次 NLS 与 Hartree 方程解的高 Sobolev 范数增长,并改进 Hartree 方程在周期情形下的界。

摘要:

本文考虑实直线上的三次非线性 Schrödinger 方程以及具有足够正则卷积势的 Hartree 方程。我们关注的是对这些方程解的高 Sobolev 范数增长作出界定。由于三次 NLS 完全可积,因此仅对初始数据具有受限光滑性的解的分数阶 Sobolev 范数进行界定是合理的。对于 Hartree 方程,我们考虑所有 Sobolev 范数。对于这两个方程,我们通过使用适当的频率分解来推导结果。在三次 NLS 的情形下,该方法使我们能够恢复整数阶 Sobolev 范数的一致界,误差因子不超过 $t^{0+}$。对于 Hartree 方程,我们采用此前在 $S^1$ 上工作中的相同方法,并结合改进的 Strichartz 估计,得到了优于此前周期情形下所得结果的界。

英文摘要:

In this paper, we consider the cubic nonlinear Schrodinger equation, and the Hartree equation, with sufficiently regular convolution potential, both on the real line. We are interested in bounding the growth of high Sobolev norms of solutions to these equations. Since the cubic NLS is completely integrable, it makes sense to bound only the fractional Sobolev norms of solutions, whose initial data is of restricted smoothness. For the Hartree equation, we consider all Sobolev norms. For both equations, we derive our results by using an appropriate frequency decomposition. In the case of the cubic NLS, this method allows us to recover uniform bounds on the integral Sobolev norms, up to a factor of $t^{0+}$. For the Hartree equation, we use the same method as in our previous work on $S^1$, and the improved Strichartz estimate to obtain a better bound than we previously obtained in the periodic setting.

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