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arXiv 2103.07867math.AP
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二维拟线性wave equations的能量一致有界

The top-order energy of quasilinear wave equations in two space dimensions is uniformly bounded

Shijie Dong, Philippe G. LeFloch, Zhen Lei

摘要:

Alinhac在2001年解决了一个长期存在的开放问题,并建立了具有二次零非线性的二维空间中的拟线性波动方程允许全局时间解,前提是初始数据是紧支撑的,并且在Sobolev范数下足够小。在这项工作中,Alinhac得到了一个上界多项式增长的时间的最高阶能量的解决方案。一个自然的问题随之产生,尽管基本能量可能守恒,时间增长是否是一个真实的现象。类似的问题对于二维空间中的薛定谔方程和不可压缩的欧拉方程也是非常重要的,正如布尔甘、科利安德-基尔-斯塔菲兰尼-高冈-陶、基谢夫-斯韦拉克等人所研究的那样。本文证明了Alinhac定理中解的顶阶能量在时间上是全局有界的,这与Alinhac的无穷大爆破猜想相反。

英文摘要:

Alinhac solved a long-standing open problem in 2001 and established that quasilinear wave equations in two space dimensions with quadratic null nonlinearities admit global-in-time solutions, provided that the initial data are compactly supported and sufficiently small in Sobolev norm. In this work, Alinhac obtained an upper bound with polynomial growth in time for the top-order energy of the solutions. A natural question then arises whether the time-growth is a true phenomena, despite the possible conservation of basic energy. Analogous problems are also of central importance for Schrödinger equations and the incompressible Euler equations in two space dimensions, as studied by Bourgain, Colliander-Keel-Staffilani-Takaoka-Tao, Kiselev-Sverak, and others. In the present paper, we establish that the top-order energy of the solutions in Alinhac theorem remains globally bounded in time, which is opposite to Alinhac's blowup-at-infinity conjecture.

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