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arXiv 1812.06985hep-thgr-qc
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非极值面积的对偶:高维微分熵

The dual of non-extremal area: differential entropy in higher dimensions

Vijay Balasubramanian, Charles Rabideau

摘要:

Ryu-Takayanagi公式将场论中的纠缠熵与锚定在对偶AdS空间边界上的极值曲面的面积联系起来。这是有趣的问,如果也有一个信息理论的解释,不一定是边界锚定的非极值表面的地区。一般来说,在对偶边界场论中,这种表面之外的物理现象与被限制在时间带内的观察者有关。当后者是二维的,它是已知的微分熵相关的带计算的长度的双体积曲线,并有一个解释方面的信息成本贝尔对恢复相关性无法访问的观察员在带。这种形式主义在更高维度的一般实现是未知的。我们首先基于熵c-定理证明了一个不可行定理,该定理消除了高维微分熵的候选表达式。在此基础上,我们提出了一个新的球形区域纠缠熵形状导数积分公式。我们的建议源于物理要求,微分熵必须是局部有限的,共形不变的。在场论中著名的纠缠熵的紫外发散的要求取消引导我们到我们的猜想,我们测试表面在$AdS_4$。我们的结果为任意维的场论提供了一个候选的c函数。

英文摘要:

The Ryu-Takayanagi formula relates entanglement entropy in a field theory to the area of extremal surfaces anchored to the boundary of a dual AdS space. It is interesting to ask if there is also an information theoretic interpretation of the areas of non-extremal surfaces that are not necessarily boundary-anchored. In general, the physics outside such surfaces is associated to observers restricted to a time-strip in the dual boundary field theory. When the latter is two-dimensional, it is known that the differential entropy associated to the strip computes the length of the dual bulk curve, and has an interpretation in terms of the information cost in Bell pairs of restoring correlations inaccessible to observers in the strip. A general realization of this formalism in higher dimensions is unknown. We first prove a no-go theorem eliminating candidate expressions for higher dimensional differential entropy based on entropic c-theorems. Then we propose a new formula in terms of an integral of shape derivatives of the entanglement entropy of ball shaped regions. Our proposal stems from the physical requirement that differential entropy must be locally finite and conformally invariant. Demanding cancellation of the well-known UV divergences of entanglement entropy in field theory guides us to our conjecture, which we test for surfaces in $AdS_4$. Our results suggest a candidate c-function for field theories in arbitrary dimensions.

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