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LOW REGULARITY WELL-POSEDNESS FOR THE PERIODIC KAWAHARA EQUATION

机译:周期河原方程的正则性低

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摘要

In this paper, we consider the well-posedness for the Cauchy problem of the Kawahara equation with low regularity data in the periodic case. We obtain the local well-posedness for s ≥ -3=2 by a variant of the Fourier restriction norm method introduced by Bourgain. Moreover, these local solutions can be extended globally in time for s ≥ -1 by the I-method. On the other hand, we prove ill-posedness for s < -3=2 in some sense. This is a sharp contrast to the results in the case of R, where the critical exponent is equal to -2.
机译:在本文中,我们考虑了周期情况下具有低规则性数据的Kawahara方程Cauchy问题的适定性。我们通过Bourgain引入的Fourier限制范数方法的变体获得s≥-3 = 2的局部适定性。而且,这些局部解可以通过I方法在s≥-1的时间内在全局范围内扩展。另一方面,在某种意义上我们证明了s <-3 = 2的不适定性。这与R情况(临界指数等于-2)的结果形成鲜明对比。

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