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arXiv 0802.3117hep-thcond-mat.stat-mechgr-qcmath.DGquant-ph
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纠缠熵、共形不变性与非本征几何

Entanglement entropy, conformal invariance and extrinsic geometry

Sergey N. Solodukhin

摘要:

我们利用共形不变性和全息对应,详细描述了量子强耦合${\mathcal{N}}=4$ SU(N)超共形规范理论的两个子系统之间的二维表面$Σ$的外赋几何对纠缠熵的依赖关系.我们推广了这个结果,计算了一般的4d共形场论的纠缠熵。作为一个副产品,我们得到了一个封闭的形式的纠缠熵在平坦时空中的$Σ$是球$S_2$和当$Σ$是二维柱。A型共形异常对纠缠熵的贡献总是由表面$Σ$的拓扑结构决定的,而对$Σ$的外赋几何结构的依赖性则是由B型共形异常引起的.

英文摘要:

We use the conformal invariance and the holographic correspondence to fully specify the dependence of entanglement entropy on the extrinsic geometry of the 2d surface $Σ$ that separates two subsystems of quantum strongly coupled ${\mathcal{N}}=4$ SU(N) superconformal gauge theory. We extend this result and calculate entanglement entropy of a generic 4d conformal field theory. As a byproduct, we obtain a closed-form expression for the entanglement entropy in flat space-time when $Σ$ is sphere $S_2$ and when $Σ$ is two-dimensional cylinder. The contribution of the type A conformal anomaly to entanglement entropy is always determined by topology of surface $Σ$ while the dependence of the entropy on the extrinsic geometry of $Σ$ is due to the type B conformal anomaly.

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