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arXiv 1507.06997hep-thcond-mat.stat-mechcond-mat.str-elgr-qcquant-ph
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由扭转算符得到的普适角纠缠

Universal corner entanglement from twist operators

Pablo Bueno, Robert C. Myers, William Witczak-Krempa

摘要:

在三维共形场论(CFTs)中,当纠缠面包含一个具有张开角$θ$的尖角时,纠缠熵得到一个与调节器无关的函数$a(θ)$的对数贡献.在光滑表面($θ\rightarrowπ$)的极限中,该角贡献作为$a(θ)=σ\,(θ-π)^2$消失。在arXiv:1505.04804中,我们为猜想提供了证据,即对于任何$d=3$ CFT,角系数$σ$由$C_T$确定,该系数出现在应力张量的两点函数中。在这里,我们认为,这是一个更一般的关系连接类似的角落系数$σ_n$出现在$n$第雷尼熵和相应的扭曲算子的缩放维度$h_n$的一个特殊的例子。特别地,我们发现简单的关系$h_n/σ_n=(n-1)π$。我们展示了它如何减少到我们以前的结果为$n\rightarrow 1$,并明确检查其有效性的自由标量和费米子。利用这个新的关系,我们证明了作为$n\rightarrow 0$,$σ_n$产生热熵系数$c_S$。我们还揭示了一个令人惊讶的对偶性有关的标量和费米子的角系数。此外,我们使用我们的结果来预测$σ_n$的全息CFTs双四维爱因斯坦引力。我们的研究结果推广到其他方面,我们强调的$d=2$ CFTs的间隔雷尼熵的连接。

英文摘要:

The entanglement entropy in three-dimensional conformal field theories (CFTs) receives a logarithmic contribution characterized by a regulator-independent function $a(θ)$ when the entangling surface contains a sharp corner with opening angle $θ$. In the limit of a smooth surface ($θ\rightarrowπ$), this corner contribution vanishes as $a(θ)=σ\,(θ-π)^2$. In arXiv:1505.04804, we provided evidence for the conjecture that for any $d=3$ CFT, this corner coefficient $σ$ is determined by $C_T$, the coefficient appearing in the two-point function of the stress tensor. Here, we argue that this is a particular instance of a much more general relation connecting the analogous corner coefficient $σ_n$ appearing in the $n$th Rényi entropy and the scaling dimension $h_n$ of the corresponding twist operator. In particular, we find the simple relation $h_n/σ_n=(n-1)π$. We show how it reduces to our previous result as $n\rightarrow 1$, and explicitly check its validity for free scalars and fermions. With this new relation, we show that as $n\rightarrow 0$, $σ_n$ yields the coefficient of the thermal entropy, $c_S$. We also reveal a surprising duality relating the corner coefficients of the scalar and the fermion. Further, we use our result to predict $σ_n$ for holographic CFTs dual to four-dimensional Einstein gravity. Our findings generalize to other dimensions, and we emphasize the connection to the interval Rényi entropies of $d=2$ CFTs.

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