Holographic Renyi entropy of 2d CFT in KdV generalized ensemble
Abstract 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. Thi...
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2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)067 |
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| author | Liangyu Chen Anatoly Dymarsky Jia Tian Huajia Wang |
| author_facet | Liangyu Chen Anatoly Dymarsky Jia Tian Huajia Wang |
| author_sort | Liangyu Chen |
| collection | DOAJ |
| description | Abstract 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 [1], 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 Q 1 $$ \left\langle {\mathcal{Q}}_1\right\rangle $$ = q 1, Q 3 $$ \left\langle {\mathcal{Q}}_3\right\rangle $$ = q 3 fixed and obeying q 3 − q 1 2 ≪ q 1 2 $$ {q}_1^2\ll {q}_1^2 $$ . In this regime we found that the refined Renyi entropy S ~ n $$ {\overset{\sim }{S}}_n $$ is n-independent for n > n cut, where n cut depends on q 1, q 3. By taking the primary state limit q 3 → q 1 2 $$ {q}_1^2 $$ , 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. |
| format | Article |
| id | doaj-art-2c65064d609542a49715e92536c47a1a |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
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| series | Journal of High Energy Physics |
| spelling | doaj-art-2c65064d609542a49715e92536c47a1a2025-01-19T12:07:11ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025115010.1007/JHEP01(2025)067Holographic Renyi entropy of 2d CFT in KdV generalized ensembleLiangyu Chen0Anatoly Dymarsky1Jia Tian2Huajia Wang3Kavli Institute for Theoretical Sciences, University of Chinese Academy of SciencesDepartment of Physics and Astronomy, University of KentuckyKavli Institute for Theoretical Sciences, University of Chinese Academy of SciencesKavli Institute for Theoretical Sciences, University of Chinese Academy of SciencesAbstract 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 [1], 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 Q 1 $$ \left\langle {\mathcal{Q}}_1\right\rangle $$ = q 1, Q 3 $$ \left\langle {\mathcal{Q}}_3\right\rangle $$ = q 3 fixed and obeying q 3 − q 1 2 ≪ q 1 2 $$ {q}_1^2\ll {q}_1^2 $$ . In this regime we found that the refined Renyi entropy S ~ n $$ {\overset{\sim }{S}}_n $$ is n-independent for n > n cut, where n cut depends on q 1, q 3. By taking the primary state limit q 3 → q 1 2 $$ {q}_1^2 $$ , 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.https://doi.org/10.1007/JHEP01(2025)067AdS-CFT CorrespondenceConformal and W SymmetryHolography and Condensed Matter Physics (AdS/CMT)Black Holes |
| spellingShingle | Liangyu Chen Anatoly Dymarsky Jia Tian Huajia Wang Holographic Renyi entropy of 2d CFT in KdV generalized ensemble Journal of High Energy Physics AdS-CFT Correspondence Conformal and W Symmetry Holography and Condensed Matter Physics (AdS/CMT) Black Holes |
| title | Holographic Renyi entropy of 2d CFT in KdV generalized ensemble |
| title_full | Holographic Renyi entropy of 2d CFT in KdV generalized ensemble |
| title_fullStr | Holographic Renyi entropy of 2d CFT in KdV generalized ensemble |
| title_full_unstemmed | Holographic Renyi entropy of 2d CFT in KdV generalized ensemble |
| title_short | Holographic Renyi entropy of 2d CFT in KdV generalized ensemble |
| title_sort | holographic renyi entropy of 2d cft in kdv generalized ensemble |
| topic | AdS-CFT Correspondence Conformal and W Symmetry Holography and Condensed Matter Physics (AdS/CMT) Black Holes |
| url | https://doi.org/10.1007/JHEP01(2025)067 |
| work_keys_str_mv | AT liangyuchen holographicrenyientropyof2dcftinkdvgeneralizedensemble AT anatolydymarsky holographicrenyientropyof2dcftinkdvgeneralizedensemble AT jiatian holographicrenyientropyof2dcftinkdvgeneralizedensemble AT huajiawang holographicrenyientropyof2dcftinkdvgeneralizedensemble |