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arXiv 2202.03020math.AP
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五次四阶薛定谔方程的不适定性

Ill-posedness of quintic fourth order Schrödinger equation

Bo Xia, Deng Zhang

摘要:

证明了五次四阶非线性薛定谔方程的解映射在超临界正则性的索伯列夫空间中的每一点都具有范数膨胀现象.实际上,我们分别在负正则性和正正则性的情况下证明了这个结果。在负正则情形下,我们证明了离焦和聚焦方程的结果:在一维情形下,在超临界正则(包括临界指数)的索伯列夫空间中,相应的解映射表现出范数膨胀;在高维情形下,解映射在负正则空间中表现出同样的现象.同时,在正则性为正的情况下,证明了在$d=3,4,5$维上的离焦方程的结果。我们的证明是基于“高到低”和“低到高”的频率级联分别。

英文摘要:

We prove that the solution map, associated to the quintic fourth order nonlinear Schrödinger equation, exhibits the norm inflation phenomenon at every point in the Sobolev spaces of super-critical regularity. Indeed, we prove this result separately in the cases of negative and of positive regularity. In the negative regularity case, we prove the result for both the defocusing and focusing equations: in the one dimensional case, the associated solution map exhibits norm inflation in Sobolev spaces of super-critical regularity (including the critical index); in the higher dimensional case, the solution map exhibits the same phenomenon in spaces of negative regularity. Meanwhile, in the case of positive regularity, we prove the result for the defocusing equation in dimensions $d=3,4,5$. Our proofs are based on the "high-to-low" and "low-to-high" frequency cascades respectively.

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