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arXiv 2409.19271hep-th
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KdV广义系综下二维共形场论的全息Rényi熵

Holographic Renyi entropy of 2d CFT in KdV generalized ensemble

Liangyu Chen, Anatoly Dymarsky, Jia Tian, Huajia Wang

AI总结:

针对混沌二维CFT中基本态平坦纠缠谱与传统ETH的矛盾,本文在AdS/CFT框架下用粘合构造计算KdV广义微正则系综的全息Rényi熵,验证了KdV广义ETH的自洽性。

摘要:

混沌二维共形场论(CFT)中的本征态热化假说(ETH)因存在无穷多守恒KdV荷而变得微妙。已有研究表明,CFT的基本本征态具有平坦的纠缠谱,这与微正则系综的结果差异极大。该结论与未考虑KdV荷的传统ETH存在明显矛盾。在配套论文[KdVETHgeneral]中,我们通过研究混沌CFT在KdV广义吉布斯系综与微正则系综下的子系统熵,解决了这一差异。\n本文在AdS/CFT对偶框架下开展了平行计算。我们聚焦于共形理论中等价于热力学极限的高密度极限,该极限下可通过所谓的“粘合构造”计算全息Rényi熵。我们明确研究了前两个KdV荷的密度⟨Q₁⟩=q₁、⟨Q₃⟩=q₃固定且满足q₃−q₁²≪q₁²的KdV广义微正则系综。在该区间内,我们发现修正Rényi熵S̃ₙ在n>n_cut时与n无关,其中n_cut由q₁、q₃决定。取q₃→q₁²的基本态极限时,我们恢复了固定面积态特有的平坦纠缠谱,与基本态的行为一致。这为二维CFT中KdV广义ETH提供了自洽性检验。

英文摘要:

The eigenstate thermalization hypothesis (ETH) in chaotic two dimensional CFTs is subtle due to infinitely many conserved KdV charges. Previous works have demonstrated that primary CFT eigenstates have flat entanglement spectrum, which is very different from the microcanonical ensemble. This result is an apparent contradiction to conventional ETH, which does not take KdV charges into account. In a companion paper \cite{KdVETHgeneral}, we resolve this discrepancy by studying the subsystem entropy of a chaotic CFT in KdV-generalized Gibbs and microcanonical ensembles. In this paper, we carry out parallel computations in the context of AdS/CFT. We focus on the high density limit, which is equivalent to thermodynamic limit in conformal theories. In this limit holographic Renyi entropy can be computed using the so-called gluing construction. We explicitly study the KdV-generalized microcanonical ensemble with the densities of the first two KdV charges $\langle \mathcal{Q}_1\rangle = q_1,\langle \mathcal{Q}_3\rangle = q_3$ fixed and obeying $q_3-q_1^2 \ll q_1^2$. In this regime we found that the refined Renyi entropy $\tilde{S}_n$ is $n$-independent for $n>n_{cut}$, where $n_{cut}$ depends on $q_1,q_3$. By taking the primary state limit $q_3\to q_1^2$, we recover flat entanglement spectrum characteristic of fixed-area states, in agreement with the primary state behavior. This provides a consistency check of the KdV-generalized ETH in 2d CFTs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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