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arXiv 1503.07599math.AP
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双稳态和点火反应过渡前沿的存在和不存在

Existence and non-existence of transition fronts for bistable and ignition reactions

Andrej Zlatos

摘要:

本文研究一维空间中具有一般(空间或时间)非均匀混合双稳点火反应的反应扩散方程。对于那些满足一个简单的定量假设,我们证明了存在性和唯一性的过渡战线,以及收敛的“典型”的解决方案的唯一过渡战线(存在部分甚至扩展到混合双稳态点火单稳态反应)。这些结果也适用于所有的纯点火反应没有任何其他的假设,但不是所有的纯双稳态反应。事实上,我们找到了空间或时间周期性纯双稳态反应(与其他时空变量无关)的例子,我们可以证明不存在过渡前沿。这是第一个这样的结果,周期性介质是非退化的自然意义上,空间周期的例子也证明了一个猜想从\cite{DHZ}。

英文摘要:

We study reaction-diffusion equations in one spatial dimension and with general (space- or time-) inhomogeneous mixed bistable-ignition reactions. For those satisfying a simple quantitative hypothesis, we prove existence and uniqueness of transition fronts, as well as convergence of "typical" solutions to the unique transition front (the existence part even extends to mixed bistable-ignition-monostable reactions). These results also hold for all pure ignition reactions without any other hypotheses, but not for all pure bistable reactions. In fact, we find examples of either spatially or temporally periodic pure bistable reactions (independent of the other space-time variable) for which we can prove non-existence of transition fronts. These are the first such results for periodic media which are non-degenerate in a natural sense, and the spatially periodic examples also prove a conjecture from \cite{DHZ}.

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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