arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.11704math.AP
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具有奇异不定常传播速度的抽象wave equations的有限与无限导数损失

Finite vs infinite derivative loss for abstract wave equations with singular time-dependent propagation speed

Marina Ghisi, Massimo Gobbino

摘要:

我们考虑一个抽象的波动方程,其传播速度只依赖于时间。我们调查的情况下,传播速度是光滑的正倍,但在初始时间可能奇异的有限导数损失的适定性结果。我们证明,解决方案表现出有限的衍生损失的家庭的条件下,涉及的一阶和二阶导数的传播速度的爆破率,在精神上,较弱的是对一阶导数的要求,较强的是对二阶导数的要求。我们的家庭之间的两个极限情况下,已经在文献中已知的条件插值。我们还提供了反例表明,只要我们的条件失败,解决方案可以表现出无限的衍生损失。即使在这两种极端情况下,这种病症的存在也是一个悬而未决的问题。

英文摘要:

We consider an abstract wave equation with a propagation speed that depends only on time. We investigate well-posedness results with finite derivative loss in the case where the propagation speed is smooth for positive times, but potentially singular at the initial time. We prove that solutions exhibit a finite derivative loss under a family of conditions that involve the blow up rate of the first and second derivative of the propagation speed, in the spirit that the weaker is the requirement on the first derivative, the stronger is the requirement on the second derivative. Our family of conditions interpolates between the two limit cases that were already known in the literature. We also provide the counterexamples that show that, as soon as our conditions fail, solutions can exhibit an infinite derivative loss. The existence of such pathologies was an open problem even in the two extreme cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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