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arXiv 1007.1813hep-th
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n球的纠缠熵

Entanglement entropy for the n-sphere

H. Casini, M. Huerta

摘要:

我们计算了任意维球体与无质量标量场的纠缠熵。约化的密度矩阵表示为保形变换的无穷小生成元,保持球面不变。将问题映射为双曲空间中的热气体问题,并采用热核方法求解。对2维和4维时空熵的对数项系数与以前的数值和解析结果一致。特别是,四维的结果,连同Solodukhin报告的一个,给支持Ryu-Takayanagi全息anzats。我们还发现,有没有对数贡献的熵奇数时空维。

英文摘要:

We calculate the entanglement entropy for a sphere and a massless scalar field in any dimensions. The reduced density matrix is expressed in terms of the infinitesimal generator of conformal transformations keeping the sphere fixed. The problem is mapped to the one of a thermal gas in a hyperbolic space and solved by the heat kernel approach. The coefficient of the logarithmic term in the entropy for 2 and 4 spacetime dimensions are in accordance with previous numerical and analytical results. In particular, the four dimensional result, together with the one reported by Solodukhin, gives support to the Ryu-Takayanagi holographic anzats. We also find there is no logarithmic contribution to the entropy for odd space time dimensions.

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