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arXiv 2002.00966hep-thcond-mat.stat-mechgr-qc
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相互作用理论中的时空纠缠熵

Towards Spacetime Entanglement Entropy for Interacting Theories

Yangang Chen, Lucas Hackl, Ravi Kunjwal, Heidar Moradi, Yasaman K. Yazdi, Miguel Zilhão

摘要:

引力场中量子场的纠缠熵是一个越来越重要的课题。这种纠缠熵通常是相对于柯西超曲面计算的,在柯西超曲面中,可以通过部分追踪将简化的密度矩阵与感兴趣的类空区域相关联。近年来,索尔金提出了另一种明显协变的熵公式,即时空两点关联函数。这个公式,高斯标量场理论,是明确的时空性质,并回避了一些可能的非协方差问题所面临的传统配方。在本文中,我们采取的第一步扩展索尔金熵的非高斯理论,威克定理不再成立,人们会期望更高的熵贡献。我们认为四次扰动远离高斯的情况下,发现在扰动理论的一阶,由索尔金推导出的熵公式继续持有,但与两点的扰动校正的同行取代。然后,我们表明,我们的结果继续保持任意微扰(玻色子和费米理论)。这是一个重要的结果,据我们所知,这是一个新颖的结果。此外,我们还导出了一阶和二阶任意微扰下的纠缠熵的封闭式公式。我们的工作还建议途径进一步扩展到一般的相互作用理论。

英文摘要:

Entanglement entropy of quantum fields in gravitational settings is a topic of growing importance. This entropy of entanglement is conventionally computed relative to Cauchy hypersurfaces where it is possible via a partial tracing to associate a reduced density matrix to the spacelike region of interest. In recent years Sorkin has proposed an alternative, manifestly covariant, formulation of entropy in terms of the spacetime two-point correlation function. This formulation, developed for a Gaussian scalar field theory, is explicitly spacetime in nature and evades some of the possible non-covariance issues faced by the conventional formulation. In this paper we take the first steps towards extending Sorkin's entropy to non-Gaussian theories where Wick's theorem no longer holds and one would expect higher correlators to contribute. We consider quartic perturbations away from the Gaussian case and find that to first order in perturbation theory, the entropy formula derived by Sorkin continues to hold but with the two-point correlators replaced by their perturbation-corrected counterparts. We then show that our results continue to hold for arbitrary perturbations (of both bosonic and fermionic theories). This is a non-trivial and, to our knowledge, novel result. Furthermore we also derive closed-form formulas of the entanglement entropy for arbitrary perturbations at first and second order. Our work also suggests avenues for further extensions to generic interacting theories.

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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