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arXiv 2005.09932math.AP
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基态以下能量临界Zakharov系统的全局适定性

Global wellposedness for the energy-critical Zakharov system below the ground state

Timothy Candy, Sebastian Herr, Kenji Nakanishi

AI总结:

本文研究四维能量临界Zakharov系统的柯西问题,借助带势薛定谔方程的一致Strichartz估计及新的双线性傅里叶限制估计,证明能量和波质量低于基态阈值的非径向初值在全能量空间中全局适定。

摘要:

本文研究能量临界维数$d=4$下Zakharov系统的柯西问题。我们证明,对于能量和波质量均低于基态阈值的任意初值,在完整(非径向)能量空间中全局适定性成立。该结果基于带势薛定谔方程的Strichartz估计。更确切地说,我们证明了对于满足质量低于基态约束的自由波方程的任意势,Strichartz估计一致成立。关键的新要素是针对强迫项位于对偶端点Strichartz空间的非齐次薛定谔方程解的双线性(伴随)傅里叶限制估计。

英文摘要:

The Cauchy problem for the Zakharov system in the energy-critical dimension $d=4$ is considered. We prove that global well-posedness holds in the full (non-radial) energy space for any initial data with energy and wave mass below the ground state threshold. The result is based on a Strichartz estimate for the Schrödinger equation with a potential. More precisely, a Strichartz estimate is proved to hold uniformly for any potential solving the free wave equation with mass below the ground state constraint. The key new ingredient is a bilinear (adjoint) Fourier restriction estimate for solutions of the inhomogeneous Schrödinger equation with forcing in dual endpoint Strichartz spaces.

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