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arXiv 2406.05795hep-thquant-ph
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空间子区域中相对论量子场的时间演化

Time Evolution of Relativistic Quantum Fields in Spatial Subregions

Markus Schröfl, Stefan Floerchinger

AI总结:

本文利用 Feynman-Vernon 影响泛函研究空间子区域中相对论量子场的约化动力学,推导出能量不守恒且时空非局域的随机运动方程,为理解局域热化和流体动力学联系提供基础。

摘要:

我们研究限制在空间子区域 $Ω$ 内的相对论量子场论态的时间演化。更确切地说,我们使用 Feynman-Vernon 影响泛函形式来描述在积分掉外部自由度后,$Ω$ 内部场论的动力学。我们展示了环境的影响如何被编码在一个边界项中。此外,我们推导了内部场期望值的随机运动方程。我们发现以这种方式得到的边界条件在能量上不守恒,并且在空间和时间上是非局域的。我们的结果可用于理解相对论量子场论中局域热化的出现,以及量子场论与相对论流体动力学之间的关系。

英文摘要:

We study the time evolution of a state of a relativistic quantum field theory restricted to a spatial subregion $Ω$. More precisely, we use the Feynman-Vernon influence functional formalism to describe the dynamics of the field theory in the interior of $Ω$ arising after integrating out the degrees of freedom in the exterior. We show how the influence of the environment gets encoded in a boundary term. Furthermore, we derive a stochastic equation of motion for the field expectation value in the interior. We find that the boundary conditions obtained in this way are energy non-conserving and non-local in space and time. Our results find applications in understanding the emergence of local thermalization in relativistic quantum field theories and the relationship between quantum field theory and relativistic fluid dynamics.

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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