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arXiv 1209.4646hep-thastro-ph.COcond-mat.stat-mechquant-ph
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标量场理论中的纠缠熵

Entanglement Entropy in Scalar Field Theory

Mark P. Hertzberg

摘要:

理解纠缠熵对量子场论中重整化质量的依赖性可以提供对量子相变等现象的洞察,因为质量在相变附近以奇异的方式变化。本文用微扰方法计算了相互作用标量场理论中的纠缠熵,着重研究了纠缠熵与场质量的关系。我们研究了基态的λ φ ^4和g φ ^3理论。通过跟踪超过半个空间,使用副本技巧和位置空间格林函数的圆锥,我们表明,时空体积发散取消和重整化可以一致地在这个圆锥形几何。我们建立了有限的贡献的纠缠熵两圈的顺序,涉及有限面积法。由此得到的熵是简单而直观的:通过用零动量重整化标度下的重整化质量m_r代替裸质量m,将d=3时的自由理论结果Δ S ~ A m^2 ln(m^2)修改到首阶。

英文摘要:

Understanding the dependence of entanglement entropy on the renormalized mass in quantum field theories can provide insight into phenomena such as quantum phase transitions, since the mass varies in a singular way near the transition. Here we perturbatively calculate the entanglement entropy in interacting scalar field theory, focussing on the dependence on the field's mass. We study lambda phi^4 and g phi^3 theories in their ground state. By tracing over a half space, using the replica trick and position space Green's functions on the cone, we show that space-time volume divergences cancel and renormalization can be consistently performed in this conical geometry. We establish finite contributions to the entanglement entropy up to two-loop order, involving a finite area law. The resulting entropy is simple and intuitive: the free theory result in d=3 (that we included in an earlier publication) Delta S ~ A m^2 ln(m^2) is altered, to leading order, by replacing the bare mass m by the renormalized mass m_r evaluated at the renormalization scale of zero momentum.

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