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arXiv 0707.3202hep-phnucl-th
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瞬时Bethe-Salpeter形式的稳定性:谐振子约化Salpeter方程

Stability in the instantaneous Bethe-Salpeter formalism: harmonic-oscillator reduced Salpeter equation

Z. -F. Li, Wolfgang Lucha, F. Schoberl

摘要:

在量子场论中,描述束缚态的贝特-萨尔彼得形式主义的一个流行的三维约化是萨尔彼得方程,通过假设所有束缚态成分的瞬时相互作用和自由传播而导出。数值(变分)研究的萨尔彼得方程与限制相互作用,但是,观察到特定的不稳定性的解决方案,可能与克莱因悖论和渲染(部分)束缚态不稳定。对于只含谐振子约束相互作用的约化Salpeter方程,通过全面的谱分析对这个问题进行解析研究是可行的。在那里,我们能够严格证明,束缚态的解决方案对应于真正的离散能量谱从下面有界,因此没有任何不稳定性。

英文摘要:

A popular three-dimensional reduction of the Bethe-Salpeter formalism for the description of bound states in quantum field theory is the Salpeter equation, derived by assuming both instantaneous interactions and free propagation of all bound-state constituents. Numerical (variational) studies of the Salpeter equation with confining interaction, however, observed specific instabilities of the solutions, likely related to the Klein paradox and rendering (part of the) bound states unstable. An analytic investigation of this problem by a comprehensive spectral analysis is feasible for the reduced Salpeter equation with only harmonic-oscillator confining interactions. There we are able to prove rigorously that the bound-state solutions correspond to real discrete energy spectra bounded from below and are thus free of any instabilities.

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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