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arXiv 1901.08409math.AP
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一维Maxwell-Dirac方程的尖锐不适定性

Sharp ill-posedness for the Maxwell-Dirac equations in one space dimension

Sigmund Selberg, Achenef Tesfahun

摘要:

证明了一维Maxwell-Dirac方程在荷类中的适定性,即旋量的数据为$L^2$。我们还证明,这个结果是尖锐的,在这个意义上,适定性失败的旋量数据在$H^s$与$s<0$,以及在$L^p$与$1 \le p < 2$。更确切地说,我们给出了一个明确的例子,这样的数据,没有本地解决方案可以存在。我们的适定性证明适用于一类系统,其中也包括Dirac-Klein-Gordon系统,但它不需要任何零结构的系统。

英文摘要:

The Maxwell-Dirac equations in one space dimension are proved to be well posed in the charge class, that is, with $L^2$ data for the spinor. We also prove that this result is sharp, in the sense that well-posedness fails for spinor data in $H^s$ with $s<0$, as well as in $L^p$ with $1 \le p < 2$. More precisely, we give an explicit example of such data for which no local solution can exist. Our proof of well-posedness applies to a class of systems which includes also the Dirac-Klein-Gordon system, but it does not require any null structure in the system.

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