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arXiv 1606.00871math.AP
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二维狄拉克方程:阈值障碍物的色散估计和分类

The Dirac equation in two dimensions: Dispersive estimates and classification of threshold obstructions

M. Burak Erdogan, William R. Green

摘要:

研究了二维Dirac方程的色散估计.特别是,我们证明了狄拉克演化满足$t^{-1}$衰减率作为一个运营商从Hardy空间$H^1$到$BMO$,有界平均振荡的函数的空间。这个估计,随着$L^2$守恒律允许一个家庭推导出一个哈茨估计。我们将阈值障碍物的结构分类为由s波共振、p波共振和本征函数组成。我们表明,在薛定谔演化的情况下,阈值s波共振的存在下,不破坏的$t^{-1}$衰减率。作为我们的分析的结果,我们得到了一个限制吸收的阈值附近的原则,并表明,只有100多个本征值的光谱间隙。

英文摘要:

We investigate dispersive estimates for the two dimensional Dirac equation with a potential. In particular, we show that the Dirac evolution satisfies a $t^{-1}$ decay rate as an operator from the Hardy space $H^1$ to $BMO$, the space of functions of bounded mean oscillation. This estimate, along with the $L^2$ conservation law allows one to deduce a family of Strichartz estimates. We classify the structure of threshold obstructions as being composed of s-wave resonances, p-wave resonances and eigenfunctions. We show that, as in the case of the Schrödinger evolution, the presence of a threshold s-wave resonance does not destroy the $t^{-1}$ decay rate. As a consequence of our analysis we obtain a limiting absorption principle in the neighborhood of the threshold, and show that there are only finitely many eigenvalues in the spectral gap.

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