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arXiv 1407.7249hep-thcond-mat.str-el
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纠缠和Rényi熵与形状关系的一些结果

Some results on the shape dependence of entanglement and Rényi entropies

Andrea Allais, Márk Mezei

摘要:

研究了共形场论中纠缠熵的普适贡献与纠缠区域的关系。我们表明,对于一个变形球的变化的普遍贡献是二次的变形幅度。我们将这些结果推广到Rényi熵。我们得到了具有引力对偶的三维CFT中变形圆情况下的纠缠熵二阶变化的显式表达式。对于同一个系统,我们还考虑了一个椭圆纠缠区,并确定了数值的纠缠熵作为椭圆的长宽比的函数。基于这些三维的结果和Solodukhin的四维公式,我们推测球在所有维度上都最小化了对纠缠熵的普遍贡献。

英文摘要:

We study how the universal contribution to entanglement entropy in a conformal field theory depends on the entangling region. We show that for a deformed sphere the variation of the universal contribution is quadratic in the deformation amplitude. We generalize these results for Rényi entropies. We obtain an explicit expression for the second order variation of entanglement entropy in the case of a deformed circle in a three dimensional CFT with a gravity dual. For the same system, we also consider an elliptic entangling region and determine numerically the entanglement entropy as a function of the aspect ratio of the ellipse. Based on these three-dimensional results and Solodukhin's formula in four dimensions, we conjecture that the sphere minimizes the universal contribution to entanglement entropy in all dimensions.

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