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arXiv 2012.05247hep-th
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构造全息态的张量网络

Building Tensor Networks for Holographic States

Pawel Caputa, Jorrit Kruthoff, Onkar Parrikar

摘要:

本文讨论了二维全息共形场论中的单参数态族,该理论是通过对偶体几何中双曲切片族上的有效理论的欧几里德路径积分构造的。所讨论的有效理论是在$T\overline{T}$变形下流动的CFT,该变形将边界CFT "折叠"到体时间反射对称切片。我们提出,这些新的欧几里得路径积分状态的CFT可以解释为连续张量网络(CTN)的状态。我们认为,这些CTN状态满足Ryu-Takayanagi的最小面积上界的纠缠熵的边界区间,与系数等于$\frac{1}{4G_N}$; CTN对应的体时间反射对称切片饱和这个界限。我们还认为,在CFT的原始状态可以写为这样的CTN状态的叠加,与相应的波函数是散装Hartle-Hawking波函数。

英文摘要:

We discuss a one-parameter family of states in two-dimensional holographic conformal field theories which are constructed via the Euclidean path integral of an effective theory on a family of hyperbolic slices in the dual bulk geometry. The effective theory in question is the CFT flowed under a $T\overline{T}$ deformation, which "folds" the boundary CFT towards the bulk time-reflection symmetric slice. We propose that these novel Euclidean path integral states in the CFT can be interpreted as continuous tensor network (CTN) states. We argue that these CTN states satisfy a Ryu-Takayanagi-like minimal area upper bound on the entanglement entropies of boundary intervals, with the coefficient being equal to $\frac{1}{4G_N}$; the CTN corresponding to the bulk time-reflection symmetric slice saturates this bound. We also argue that the original state in the CFT can be written as a superposition of such CTN states, with the corresponding wavefunction being the bulk Hartle-Hawking wavefunction.

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