相互作用量子场论中的退相干：热情形
Decoherence in an Interacting Quantum Field Theory: Thermal Case
摘要：
研究了重整化量子场论系统的退相干。我们认为我们的新的相关器的方法去相干熵是通过忽略观测无法访问的干扰产生的。利用有限温度下的非平衡场论方法，我们证明了纯量子态的高斯冯诺伊曼熵渐近于相互作用热熵。在我们的模型中，退相干率可以用单粒子衰变率来描述。连接到电弱重子生成的情况下，我们还研究了系统场的质量变化对熵的影响。最后，我们比较我们的相关器的方法，现有的方法，在简单的量子力学模拟我们的场论模型的退相干。从微扰主方程得到的熵，会有物理上无法接受的长期增长。
英文摘要：
We study the decoherence of a renormalised quantum field theoretical system. We consider our novel correlator approach to decoherence where entropy is generated by neglecting observationally inaccessible correlators. Using out-of-equilibrium field theory techniques at finite temperatures, we show that the Gaussian von Neumann entropy for a pure quantum state asymptotes to the interacting thermal entropy. The decoherence rate can be well described by the single particle decay rate in our model. Connecting to electroweak baryogenesis scenarios, we moreover study the effects on the entropy of a changing mass of the system field. Finally, we compare our correlator approach to existing approaches to decoherence in the simple quantum mechanical analogue of our field theoretical model. The entropy following from the perturbative master equation suffers from physically unacceptable secular growth.
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。
