| 12.30 | | Hao-Tian Sun 孙昊田 and Jia-Ning Wang 王嘉宁 |
| 1.6 | Cheng-Hu Ge 葛成虎 | Tan Cheng and Zi-Yan Yuwen 陈坦 和 宇文子炎 |
| 1.6 | Cheng-Hu Ge 葛成虎 | Tan Chen and Zi-Yan Yuwen 陈坦 和 宇文子炎 |
| 1.13 | | Zhen-Min Zeng and Yu-Ping An 曾振民 和 安裕平 |
# Latest Journal Club
| Data | Time | Place | Reporter|
| --- | --- | --- | --- |
| 12.30 | 10.00 AM | 6420 | Wang-Wei Yu |
## Title: *New results from SH0ES*
## Reporter: Wang-Wei Yu
| 1.06 | 10.00 AM | 6420 | Chenghu Ge |
## Title: **
## Reporter: Chenghu Ge
## Abstract
I will introduce the new results from SH0ES and the data analysis about SH0ES.
I will describe the Reeh-Schlieder theorem and its Important Corollary. And I will introduce how to construct Local Algebras.
## References
-[arXiv:2112.04510](https://arxiv.org/abs/2112.04510)*A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team* by *Adam G. Riess*.
-[arXiv:1803.04993](https://arxiv.org/abs/1803.04993)*Notes on Some Entanglement Properties of Quantum Field Theory* by *Edward Witten*.
| 1.06 | 2.30 PM | 6420 | Tan Chen and Zi-Yan Yuwen |
## Title: *Introduction to Holographic Entanglement Entropy*
## Reporter: Tan Chen
## Abstract
Despite the viscosity of a fluid ranges over several order of magnitudes and is extremely sensitive to microscopic structure and molecular interactions, it has been conjectured that its minimum displays a universal value which is experimentally approached in strongly coupled fluids such as the quark-gluon plasma. Recent early-time analysis suggests that hydrodynamics could serve as a universal attractor even when the deformation gradients are large and that dissipative transport coefficients, such as viscosity, could still display a universal behavior far-from-equilibrium. Motivated by these observations, we consider the real-time dissipative dynamics of two different bottom-up conformal holographic models under large shear deformations. We compute the viscosity-to-entropy density ratio in several states driven away from equilibrium by large time dependent shear rates. In all the cases considered, we observe that, in the late-time far-from-equilibrium state, both the viscosity-entropy ratio and the dimensionless ratio between energy density and entropy density approach a universal value which is completely independent of the initial conditions, the form of the driving and the parameters of the system. Moreover, the late-time universal value coincides with the expectation from hydrodynamics naively valid only near equilibrium.
Entanglement is one of the most important concepts that distinguish quantum physics from classical physics and entanglement entropy has seen an unexpectedly wide range of applications. One of the most substantial progress in the subject is the holographic formula for entanglement entropy proposed by Ryu and Takayanagi, which has proved to be a profitable tool to explore quantum field theories and quantum gravity. I will make a introduction to holographic entanglement entropy, focusing on the application and proof of the Ryu-Takayanagi Formula. To make this introduction more accessible, I will briefly introduce the holographic principle, AdS/CFT correspondence and entanglement entropy at first.
## Title: *First Order Phase Transition Mechanism and Corresponding SGWB*
## Reporter: Zi-Yan Yuwen
## Abstract
In this seminar, I will introduce some detailed computation of first order phase transition mechanism which might happen in the early universe, including the bubble nucleation and expansion, and then briefly discuss the corresponding stochastic gravitational wave background. Especially for QCD transition and Electro-Weak transition, the peak frequency will be given.
## References
<!-- - [Arxiv:2110.14718](https://arxiv.org/abs/2110.14718) *Cosmic inflation from broken conformal symmetry* by *Rong-Gen Cai, Yu-Shi Hao* and *Shao-Jiang Wang*. -->
