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arXiv 2007.04661math.APmath.DG
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平面域上零磁场Laplacian分子基态能量的上界

Upper bounds for the ground state energy of the Laplacian with zero magnetic field on planar domains

Bruno Colbois, Alessandro Savo

摘要:

我们获得的第一个特征值的磁拉普拉斯算子的上界与封闭的潜在的$1$形式(因此,零磁场)作用于平面域$Ω$的复杂功能,与磁Neumann边界条件。众所周知,当势函数中至少有一个非整流时,第一特征值为正。通过规范不变性的最低本征值是简单的零,如果域是简单连接的,然后,我们得到的基态能量的上界只取决于孔的数量和面积之间的比率;模的数值常数的上界是尖锐的,我们表明,事实上达到平等(模常数)Aharonov-Bohm型运营商采取行动的域穿孔在最大的$ε$ -网。在最后一部分中,我们证明了上界是可以精化的,只要我们可以通过执行一些具有足够小的总长度的切割来将给定的区域变换为单连通区域;因此,我们通过孔的数量和面积之间的比率,乘以Cheeger型常数,当该域度量上接近于单连通域时,其趋于零。

英文摘要:

We obtain upper bounds for the first eigenvalue of the magnetic Laplacian associated to a closed potential $1$-form (hence, with zero magnetic field) acting on complex functions of a planar domain $Ω$, with magnetic Neumann boundary conditions. It is well-known that the first eigenvalue is positive whenever the potential admits at least one non-integral flux. By gauge invariance the lowest eigenvalue is simply zero if the domain is simply connected; then, we obtain an upper bound of the ground state energy depending only on the ratio between the number of holes and the area; modulo a numerical constant the upper bound is sharp and we show that in fact equality is attained (modulo a constant) for Aharonov-Bohm-type operators acting on domains punctured at a maximal $ε$-net. In the last part we show that the upper bound can be refined, provided that one can transform the given domain in a simply connected one by performing a number of cuts with sufficiently small total length; we thus obtain an upper bound of the lowest eigenvalue by the ratio between the number of holes and the area, multiplied by a Cheeger-type constant, which tends to zero when the domain is metrically close to a simply connected one.

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