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arXiv math-ph/0205044math-phmath.MP
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非相对论性QED的质量重整化和能级移动

Mass Renormalization and Energy Level Shift in Non-Relativistic QED

Christian Hainzl, Robert Seiringer

摘要:

本文利用非相对论量子电动力学的Pauli-Fierz模型,计算了电子在荷电核$Z$场中和量子化辐射场中的结合能。我们考虑的情况下,小耦合常数$α$,但固定的$Zα$和紫外截止$Λ$。我们证明了重整化质量后的结合能,在$α$的领导顺序,一个有限的限制,因为$Λ$走向无穷大,即,可以去除截止。由此得到的基态能移的表达式在$Zα$较小的情况下与Bethe公式一致,但在较大的情况下表现出不同的行为。

英文摘要:

Using the Pauli-Fierz model of non-relativistic quantum electrodynamics, we calculate the binding energy of an electron in the field of a nucleus of charge $Z$ and in presence of the quantized radiation field. We consider the case of small coupling constant $α$, but fixed $Zα$ and ultraviolet cut-off $Λ$. We prove that after renormalizing the mass the binding energy has, to leading order in $α$, a finite limit as $Λ$ goes to infinity; i.e., the cut-off can be removed. The expression for the ground state energy shift thus obtained agrees with Bethe's formula for small values of $Zα$, but shows a different behavior for bigger values.

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