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arXiv 1908.01800hep-th
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球中线性化引力子的纠缠熵

Entanglement entropy of linearized gravitons in a sphere

Valentin Benedetti, Horacio Casini

摘要:

在平坦的闵可夫斯基空间中,计算了球中无质量自旋$2$场的纠缠熵.我们用线性化的度规微扰场$h_{μν}$来描述这个理论,并把它分解成张量球谐函数。我们固定规范,使得a)每个角动量的两个动力学模解耦并具有标量球模的动力学,b)球内规范固定场的自由度表示定域在同一区域的理论的规范不变算子。这样,纠缠熵就等于减去了$l=0$和$l=1$模贡献的一对自由无质量标量中的一个。通用对数项的系数的结果是$-61/45$,并且与使用互信息计算的结果一致。

英文摘要:

We compute the entanglement entropy of a massless spin $2$ field in a sphere in flat Minkowski space. We describe the theory with a linearized metric perturbation field $h_{μν}$ and decompose it in tensor spherical harmonics. We fix the gauge such that a) the two dynamical modes for each angular momentum decouple and have the dynamics of scalar spherical modes, and b) the gauge-fixed field degrees of freedom inside the sphere represent gauge invariant operators of the theory localized in the same region. In this way the entanglement entropy turns out to be equivalent to the one of a pair of free massless scalars where the contributions of the $l=0$ and $l=1$ modes have been subtracted. The result for the coefficient of the universal logarithmic term is $-61/45$ and coincides with the one computed using the mutual information.

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