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arXiv 1601.04022math-phmath.MPquant-ph
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$d$维中具有自旋和赝自旋对称性的Dirac方程的精化比较定理

Refined comparison theorems for the Dirac equation with spin and pseudo--spin symmetry in $d$ dimensions

Richard L. Hall, Petr Zorin

摘要:

量子力学的经典比较定理指出,如果两个势是有序的,那么相应的能量本征值也是相似的,也就是说,如果$V_a\le V_b$,那么$E_a\le E_b$。这样的定理最近已经建立了相对论性问题,即使离散光谱不容易变分的特点。本文改进了$d\ge 1$维中具有自旋和赝自旋对称性的Dirac方程的基本比较定理。两个比较电势的图现在可以以规定的方式彼此交叉,这意味着能量值仍然是有序的。精化比较定理对一维基态和$d>1$维角动量子空间的底都是有效的。例如,在一维的最简单情况下,条件$V_a\le V_b$被$U_a\le U_b$代替,其中$U_i(x)=\int_0^x V_i(t)dt$、$x\in[0,\ \infty)$和$i=a$或$b$。

英文摘要:

The classic comparison theorem of quantum mechanics states that if two potentials are ordered then the corresponding energy eigenvalues are similarly ordered, that is to say if $V_a\le V_b$, then $E_a\le E_b$. Such theorems have recently been established for relativistic problems even though the discrete spectra are not easily characterized variationally. In this paper we improve on the basic comparison theorem for the Dirac equation with spin and pseudo--spin symmetry in $d\ge 1$ dimensions. The graphs of two comparison potentials may now cross each other in a prescribed manner implying that the energy values are still ordered. The refined comparison theorems are valid for the ground state in one dimension and for the bottom of an angular momentum subspace in $d>1$ dimensions. For instance in a simplest case in one dimension, the condition $V_a\le V_b$ is replaced by $U_a\le U_b$, where $U_i(x)=\int_0^x V_i(t)dt$, $x\in[0,\ \infty)$, and $i=a$ or $b$.

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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