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arXiv 1801.04843math-phmath.MP
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无质量自旋玻色子模型中共振与散射矩阵的关系

Relation between the Resonance and the Scattering Matrix in the massless Spin-Boson Model

Miguel Ballesteros, Dirk-André Deckert, Felix Hänle

摘要:

在描述二能级量子系统与二次量子化标量场相互作用的无质量Spin-Boson模型中,建立了散射矩阵积分核与共振之间的精确关系.为此,我们推导出一个显式公式的两体散射矩阵。我们施加一个紫外截止,并假设一个相对论性标量场的玻色子形状因子的奇异性稍小,但没有红外截止。这项工作的目的是把散射和共振理论结合在一起,并得出与Simon在[38]中提供的类似的结果,其中表明散射矩阵积分核的亚纯延拓的奇点精确地位于共振能量处。从那时起,相应的问题在量子场论中一直是公开的。据我们所知,在量子场论模型中,给出的公式在[38]的意义上提供了共振和散射理论之间的第一个严格联系。

英文摘要:

We establish the precise relation between the integral kernel of the scattering matrix and the resonance in the massless Spin-Boson model which describes the interaction of a two-level quantum system with a second-quantized scalar field. For this purpose, we derive an explicit formula for the two-body scattering matrix. We impose an ultraviolet cut-off and assume a slightly less singular behavior of the boson form factor of the relativistic scalar field but no infrared cut-off. The purpose of this work is to bring together scattering and resonance theory and arrive at a similar result as provided by Simon in [38], where it was shown that the singularities of the meromorphic continuation of the integral kernel of the scattering matrix are located precisely at the resonance energies. The corresponding problem has been open in quantum field theory ever since. To the best of our knowledge, the presented formula provides the first rigorous connection between resonance and scattering theory in the sense of [38] in a model of quantum field theory.

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