**Programme**

#### Date: 24-26/08/2019

Venue：Conference Hall 6620, the new building of the Institute of Theoretical Physics, Chinese Academy of Sciences

Projector aspect ratio: 4:3

Interfaces: VGA/HDMI/Mini-DisplayPort

Restaurant: Wuke Restaurant

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15:00-19:00 | On-sign Registration | ||

| Chair | ||

08:30-08:50 | On-sign Registration | ||

08:50-09:00 | Rong-Gen Cai | Opening | Yi Ling |

09:00-09:40 | Bin Chen | ||

09:40-10:20 | Wei Song | Warped AdS3, strings and irrelevant deformations | |

10:20-10:50 | Coffee break | ||

10:50-11:30 | Hong Lu | ||

11:30-12:10 | René Meyer | Electron Hydrodynamics & Black Holes in Anti de Sitter Space-time | |

12:10-14:00 | Lunch | ||

14:00-14:40 | Keun-Young Kim | Ya-Wen Sun | |

14:40-15:20 | Rong-Xin Miao | ||

15:20-15:50 | Fu-Wen Shu | Bit threads as a road to holographic entanglement entropy | |

15:50-16:20 | Coffee break | ||

16:20-16:50 | Sang Pyo Kim | ||

16:50-17:20 | Jia-Rui Sun | Analogue gravity and holography | |

17:20-17:50 | Qiang Wen | ||

17:50-18:05 | Zixia Wei | ||

18:05-20:00 | Dinner | ||

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| Chair | ||

09:00-09:40 | Sang-Jin Sin | Song He | |

09:40-10:20 | Matteo Baggioli | Holography with Broken Translations: do we really understand it? | |

10:20-10:50 | Coffee break | ||

10:50-11:30 | Mei Huang | ||

11:30-12:10 | Yan Liu | ||

12:10-14:00 | Lunch | ||

14:00-14:40 | Hui Zhai | Hayden-Preskill Protocol with Dicke Model | Yan Liu |

14:40-15:20 | Yu-Xiao Liu | Dark Information of Black hole | |

15:20-16:00 | Hai-Qing Zhang | Spontaneous formation of topological defects in holographic non-equilibrium dynamics | |

16:00-16:30 | Coffee break | ||

16:30-17:00 | Hua Bi Zeng | Vortex phases in single and two component holographic superconductor | |

17:00-17:30 | Jie Ren | Phase transitions of de Sitter CFTs by holography | |

17:30-17:45 | Tuna Demircik | ||

17:45-18:00 | Yun-Long Zhang | Holographic Charged Fluid with Chiral Electric Separation Effect | |

18:00-20:00 | Banquet | ||

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| Chair | ||

09:00-09:40 | Masaki Tezuka | Zhuo-Yu Xian | |

09:40-09:55 | Chen-Te Ma | ||

09:55-10:10 | Hao Xu | ||

10:10-10:30 | Coffee break | ||

10:30-12:00 | Colloquium: | The AdS/CFT correspondence and the quantum supremacy of matter. | Rong-Gen Cai |

12:00-14:00 | Lunch | ||

14:00-14:40 | Yu Chen | Pairing instability in granular SYK system | Li Li |

14:40-15:20 | Ling-Yan Hung | The Defect Verlinde formula and topological entanglement with boundaries | |

15:20-15:50 | Song He | Correlation functions, entanglement and chaos in the TT¯/JT¯-deformed CFTs | |

15:50-16:20 | Coffee break | ||

16:20-16:50 | Hai-Shan Liu | Electromagnetic duality and complexity of dyonic black holes | |

16:50-17:05 | Run-Qiu Yang | Complexity in holography and applications in quantum mechanics | |

17:05-17:20 | Mahdis Ghodrati | ||

17:20-17:35 | Yuting Zhou | Evolutions of entanglement and complexity after a thermal quench in massive gravity theory | |

17:35-20:00 | Dinner |

---------------------------------------------------------------------- Abstract ----------------------------------------------------------------------

1) Matteo Baggioli

Holography with Broken Translations: do we really understand it?

After about 10^3 papers published on the topic of homogeneous holographic models with broken translations, still, several fundamental questions are open and far from being resolved. In this talk, I will provide a status report for the field and I will discuss some of the most relevant problems for the community. What do these models represent? What are they useful for? Do we really understand them?

2) Tuna Demircik

Chiral transport in strong fields from holography

Anomaly-induced transport phenomena in presence of strong external electromagnetic fields are explored within a 4D field theory defined holographically as U(1)×U(1) Maxwell-Chern-Simons theory in Schwarzschild-AdS5. (DOI: 10.1007/JHEP05(2019)071)

3) Mahdis Ghodrati

Complexity growth rate during phase transitions

We present evidence for the connection between the potential of different fields and complexity growth rates both in conformal and confining cases. By studying different models, we also establish a strong connection between phase transitions and the discontinuities in the complexity growth rates. In the first example, for dyonic black holes that are dual to van der Waals fluids, we find a similar first-order phase transition in the behavior of the complexity growth rate. We then compare the Schwinger effect and also the behavior of complexity in the anti–de Sitter (AdS) and AdS soliton backgrounds and comment on the connection between them. Finally, in a general Gubser model of QCD, we present the connections between the potentials, entropies, speeds of sound, and complexity growth rates during crossover and first- and second-order phase transitions, and also the behavior of quasinormal modes. "based on arXiv:1808.08164."

4) Song He

Correlation functions, entanglement and chaos in the TT¯/JT¯-deformed CFTs

In this paper, we regard the TT¯TT¯/JT¯JT¯-deformed CFTs as perturbation theories and compute the first order correction of the correlation functions due to the TT¯TT¯/JT¯JT¯-deformation. As applications, we study the R\'enyi entanglement entropy of excited state in the TT¯TT¯/JT¯JT¯-deformed two-dimensional CFTs. We find, up to the perturbation first order of the deformation, the R\'enyi entanglement entropy of locally excited state will obtain a nontrivial time dependence. The excess of the R\'enyi entanglement entropy of locally excited state will also be dramatically changed up to order O(c)O(c). Furthermore, we investigate the out of time ordered correlation function to confirm that the TT¯TT¯/JT¯JT¯-deformations do not change the maximal chaotic behavior of holographic CFTs up to the first order of the deformations.

5) Mei Huang

Dense matter from holographic QCD

Chiral and deconfinement phase transitions at finite temperature and quark number chemical potential are simultaneously studied in the quenched dynamical holographic QCD model. The deconfinement phase transition is shown to be always of crossover type and the transition line depends weakly on the baryon number density. Differently, the chiral transition is of crossover at small baryon number density and it turns to be of first order at sufficient large baryon number density. A critical endpoint (CEP), at which the transition becomes second order type, appears in the chiral transition line. In certain baryon density region, the quarkyonic phase with chiral symmetry restoration and color confinement shows up. Qualitatively, this behavior is in consistent with the result in the Polyakov-loop improved Nambu-Jona-Lasinio (PNJL) model.

6) Ling-Yan Hung

The Defect Verlinde formula and topological entanglement with boundaries

I will discuss a novel generalization of the Verlinde formula relating fusion rules of defect excitations and their "half-linking numbers" I will also connect how these topological invariants control entanglement entropy of topological phases in the presence of boundaries.

7) Yan Liu

Holographic topological semimetals

The holographic duality allows us to construct and study models of strongly coupled quantum matter via dual gravitational theories. In general such models are characterized by the absence of quasiparticles, hydrodynamic behavior and Planckian dissipation times. One particular interesting class of quantum matter are ungapped topological semimetals which have many interesting properties form Hall transport to topologically protected edge states. We review the application of the holographic duality to this type of quantum matter including the construction of holographic Weyl semimetals, Nodal line semimetals, quantum phase transition to trivial states (ungapped and gapped), the holographic dual of Fermi arcs and how new unexpected transport properties, such as Hall viscosities arise. The holographic models promise to lead to new insights into the properties of this type of quantum matter.

8) Chen-Te Ma

Early-Time and Late-Time Chaos

We show the relation between the Heisenberg averaging of regularized two-points out-of-time ordered correlation function and the two-points spectral form factor in bosonic quantum mechanics. The generalization to all even-points is also discussed.

9) René Meyer

Electron Hydrodynamics & Black Holes in Anti de Sitter Space-time

Recent advances in condensed matter experiments have allowed to synthesize materials in which the electrons flow collectively as a fluid. In this talk I will first introduce the general notion of hydrodynamics as an effective theory and the approximation involved, as well as given an overview over the emerging topic of electron hydrodynamics in condensed matter systems. I will then present results of a phenomenological study of strongly coupled fluids in channel geometries motivated by the AdS/CFT correspondence. I will also discuss the effect of Hall viscosity on these channel flows, as well as characteristics of strongly correlated materials necessary in order to show strong Coulomb interactions.

10) Rongxin Miao

Weyl Anomaly Induced Current and Holography

We show that when an external magnetic field parallel to the boundary is applied, Weyl anomaly give rises to a new anomalous current transport near the boundary. Similar to the Casimir effect, this transport phenomena has its origin in the effect of the boundary on the quantum fluctuations of the vacuum. The near-boundary current takes universal form for general boundary quantum field theories, which are covariant, gauge invariant, unitary and renormalizable. We verify the universal law of current by studying free QFT and holographic BCFT. Finally, we discuss the so-called "divergence" problem and show that it can be resolved by the law of conservation of charge.

11) Jie Ren

Phase transitions of de Sitter CFTs by holography

We find a class of hyperbolic black holes in AdS space that do not have spherical or planar counterparts. By holography, these solutions are used to describe phase transitions of CFTs in de Sitter space.

12) Fu-Wen Shu

Bit threads as a road to holographic entanglement entropy

In this talk I will give a brief review on the recent progress of the holographic entanglement entropy in the framework of AdS3/CFT2, with particular attention to the bit-thread interpretation of the holographic entanglement entropy.

13) Sang-Jin Sin

Interaction Induced Quasi Particle Spectrum in Holography

It is often said that interactions destroy the particle nature of excitations. We report that in holography, the opposite phenomena can happen. That is, adding interaction term can create a new quasi particle spectrum.

14) Jia-Rui Sun

Analogue gravity and holography

Analogue gravity is the phenomena that appeared in nongravitational systems, which show many features resemble to real gravitational systems such as the appearance of curved geometry and horizon. However, the underlying dynamical connections between the analogy gravity and the real gravity were not revealed in previous studies. In this talk, we will show that, the two systems can indeed be correlated with each other from the holographic viewpoint. We will give three examples to reveal their connections.

15) Masaki Tezuka

The Sachdev-Ye-Kitaev model as a maximally chaotic lattice model: study towards experimental realization, and new characterizations of chaos

We discuss the way to realize the Sachdev-Ye-Kitaev (SYK) model experimentally, and numerically demonstrate new characterizations of quantum chaos with the SYK model and its deformation as examples.

16) Zixia Wei

Double Local Quenches in 2D CFTs and Gravitational Force

In this talk, we perform two local quenches in 2D holographic CFT, which correspond to two massive objects in the 3D gravity dual. We will talk about how to probe the effect of the gravitational force between massive objects in the CFT side.

17) Qiang Wen

Aspects on Entanglement Contour

Entanglement contour function quantifies the contribution from the degrees of freedom in any subset of the region A to the total entanglement entropy. I will discuss some aspects about entanglement contour. Firstly I will give a simple proposal for entanglement contour that involves the entanglement entropies of all the subsets inside A in two dimensions. Then I will show a holographic picture for the entanglement contour can be constructed which is consistent with the proposal.

18) Hao Xu

Unruh Quantum Otto heat engine with level degeneracy

We investigate the Unruh quantum Otto heat engine with level degeneracy.

19) Run-Qiu Yang

Complexity in holography and applications in quantum mechanics

Complexity is a tool to explore physics inside the black hole by holographic principle. We propose how to compute the complexity of operators generated by physical Hamiltonians.

20) Jan Zaanen

The AdS/CFT correspondence and the quantum supremacy of matter.

Much of the present AdS/CFT activity revolves around the “it from quantum bit” idea: the quantum entanglement in the holographic boundary is somehow coding for the bulk geometry. For a condensed matter theorist like myself the interest is the other way around: what is the real meaning of the “strongly coupled” field theory enumerated by holographic duality? It has become increasingly clear that it actually is about vacuum states that are associated with some form of maximal quantum many body entanglement: these are delocalized in the exponentially large Hilbert space requiring the quantum supremacy of the quantum computer to be exactly enumerated. AdS/CFT appears to reveal universal principle associated with this “quantum supreme matter”. Resting on eigenstate thermalization logic the observable properties of such stuff may actually appear to be unreasonably simple as compared to the semi-classical universe as I will elucidate with some examples. This in turn sheds an intriguing light on the number one quantum supreme matter candidate in the laboratory: the mysterious strange metal realized in high Tc superconductors.

21) Yun-Long Zhang

Holographic Charged Fluid with Chiral Electric Separation Effect

We investigate a minimal holographic model of the charged fluid with vector and axial currents. The chiral electric separation effect (CESE) is realized naturally when gravitational back-reaction is taken into account. [Ref:1803.08389]

22) Hai-Qing Zhang

Spontaneous formation of topological defects in holographic non-equilibrium dynamics

We perform the formation and evolution of topological defects from Kibble-Zurek mechanism in a (2 + 1)- dimensional superconductor from gauge/gravity duality, which is a ‘first-principle’ means to solve strongly correlated systems. Magnetic fluxons with quantized fluxes are observed to be generated and trapped in the core of the order parameter vortices. By investigating the dispersion of the typical winding number and vortex-vortex correlation functions, it is found that the spatial distribution of vortices exhibits short-range and nearest-neighboring vortex- antivortex pair correlations, which is in line with the Kibble-Zurek mechanism. Dynamical correlations of order parameter will first scramble in time, but later decrease to a constant as the system saturates to an ordered equilibrium state. This non-trivial evolution is believed to be linked to the presence of the vortices in the equilibrium phase.

23) YuTing Zhou

Evolutions of entanglement and complexity after a thermal quench in massive gravity theory

We study the evolution of the holographic entanglement entropy (HEE) and the holographic complexity (HC) after a thermal quench in 1+1 dimensional boundary CFTs dual to massive BTZ black holes. The study indicates how the graviton mass mg, the charge q, and also the size of the boundary region l determine the evolution of the HEE and HC. We find that for small q and l, the evolutions of the HEE and the HC is a continuous function. When q or l is tuned larger, the discontinuity emerges, which could not observed in the neutral AdS3 backgrounds. We show that, the emergence of this discontinuity is a universal behavior in the charged massive BTZ theory. With the increase of graviton mass, on the other hand, no emergence of the discontinuity behavior for any small q and l could be observed. We also show that the evolution of the HEE and HC both become stable at later times, and mg speeds up reaching to the stability during the evolution of the system. Moreover, we show that mg decreases the final stable value of HEE but raises the stable value of HC. Additionally, contrary to the usual picture in the literature that the evolution of HC has only one peak, for big enough widths, we show that graviton mass could introduce two peaks during the evolution. However, for large enough charges the one peak behavior will be recovered again. We also examine the evolutions of HEE and HC growths at the early stage, which an almost linear behavior has been detected.