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arXiv 1312.3871hep-thhep-ph
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具有源和探测器的量子场论中的显式因果关系

Manifest causality in quantum field theory with sources and detectors

Robert Dickinson, Jeff Forshaw, Peter Millington, Brian Cox

摘要:

介绍了一种在量子场论中计算散射振幅的方法,包括粒子产生和探测的影响。我们的振幅是明显的因果关系,这意味着源和检测器总是由延迟传播子的连接链连接在一起。我们展示了如何从路径积分,使用Schwinger-Keldysh的“在”形式主义,这些振幅。聚焦φ立方理论,我们确认,我们的方法同意标准的S-矩阵方法的情况下,正能量平面波散射。

英文摘要:

We introduce a way to compute scattering amplitudes in quantum field theory including the effects of particle production and detection. Our amplitudes are manifestly causal, by which we mean that the source and detector are always linked by a connected chain of retarded propagators. We show how these amplitudes can be derived from a path integral, using the Schwinger-Keldysh "in-in" formalism. Focussing on phi-cubed theory, we confirm that our approach agrees with the standard S-matrix approach in the case of positive energy plane-wave scattering.

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