AdS $_3$ / LCFT $_2$对应中的全息Rényi熵
Holographic Rényi entropy in AdS$_3$/LCFT$_2$ correspondence
摘要：
最近对AdS $_3$ /CFT $_2$对应的研究表明，在大中心电荷极限下，全息Rényi纠缠熵（HRE）的树级贡献和单圈修正与直接CFT计算完全匹配.这使得Rényi纠缠熵成为研究AdS/CFT对应的一个新窗口。本文将纯AdS $_3$引力中Rényi纠缠熵的研究推广到临界点的大质量引力理论中。对于宇宙拓扑质量引力（CTMG），对偶共形场论（CFT）可以是手征共形场论，也可以是对数共形场论（LCFT），这取决于所施加的渐近边界条件。在这两种情况下，通过研究具有小交比$x$的两个不相交区间的Rényi纠缠熵的短区间展开，我们发现经典HRE和单圈HRE与CFT结果在$x^6$阶上是完全匹配的.在这个量级上，可以清楚地看到无质量引力子和对数模之间的区别。此外，对于临界点的宇宙学新质量引力（CNMG），也可以是对数CFT的对偶，我们在CNMG/LCFT对应中发现了类似的一致性。此外，我们还从CFT计算中读出了引力子和对数模对HRE的双圈修正。它具有与纯AdS $_3$引力明显不同的特征。
英文摘要：
The recent study in AdS$_3$/CFT$_2$ correspondence shows that the tree level contribution and 1-loop correction of holographic Rényi entanglement entropy (HRE) exactly match the direct CFT computation in the large central charge limit. This allows the Rényi entanglement entropy to be a new window to study the AdS/CFT correspondence. In this paper we generalize the study of Rényi entanglement entropy in pure AdS$_3$ gravity to the massive gravity theories at the critical points. For the cosmological topological massive gravity (CTMG), the dual conformal field theory (CFT) could be a chiral conformal field theory or a logarithmic conformal field theory (LCFT), depending on the asymptotic boundary conditions imposed. In both cases, by studying the short interval expansion of the Rényi entanglement entropy of two disjoint intervals with small cross ratio $x$, we find that the classical and 1-loop HRE are in exact match with the CFT results, up to order $x^6$. To this order, the difference between the massless graviton and logarithmic mode can be seen clearly. Moreover, for the cosmological new massive gravity (CNMG) at critical point, which could be dual to a logarithmic CFT as well, we find the similar agreement in the CNMG/LCFT correspondence. Furthermore we read the 2-loop correction of graviton and logarithmic mode to HRE from CFT computation. It has distinct feature from the one in pure AdS$_3$ gravity.
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