Advanced Computing Platform for Theoretical Physics

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# Latest Journal Club
| Data | Time | Place | Reporter|
| --- | --- | --- | --- |
| 12.22 | 10.00 AM | 6420 | Yu-Shi Hao |
## Title: *Inflation with R(αβ) terms in the Palatini formulation*
## Reporter: Yu-Shi Hao
| 12.30 | 10.00 AM | 6420 | Wang-Wei Yu |
## Title: *New results from SH0ES*
## Reporter: Wang-Wei Yu
## Abstract
In this paper, the authors talk about the inflation in f(R) gravity witn high order R(αβ),and give the spectrum and tensor-to-scalar ratio with cubic action.
I will introduce the new results from SH0ES and the data analysis about SH0ES.
## References
- [arxiv:2106.12422](https://arxiv.org/abs/2106.12422) *Inflation with R(αβ) terms in the Palatini formulation* by *Jaakko Annala* and *Syksy Rasanen*
- [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*.
## Interesting papers in this week
## Join us
课题组 邀请您参加腾讯会议
会议主题:Journal Club
会议时间:2021/12/23 10:00-12:30 (GMT+08:00) 中国标准时间 - 北京
会议主题:journal club
会议时间:2021/12/29 21:30-22:00 (GMT+08:00) 中国标准时间 - 北京
点击链接入会,或添加至会议列表:
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https://meeting.tencent.com/dm/uNJl8wJ4yC62
#腾讯会议:131-417-686
#腾讯会议:308-539-048
会议密码:1234
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......@@ -61,11 +61,11 @@ https://meeting.tencent.com/dm/2ocfv96jXhmp
# Latest Group Siminar
| Data | Time | Place | Reporter|
| --- | --- | --- | --- |
| 12.22 | 2.30 PM | 6420 | Teng Ji |
## Title: *非晶固体中的非线性弹性响应、屈服效应和熵*
## Reporter: Teng Ji
| 12.30 | 2.30 PM | 6420 | Hao-Tian Sun |
## Title: *Universal shear flows in far-from-equilibrium strongly coupled conformal fluids*
## Reporter: Hao-Tian Sun
## Abstract
剪切硬化效应(剪切模量随着应变的增加而增加)以及屈服效应(材料开始发生宏观塑性变形时,出现应力明显降低的现象)在非晶固体中是非常普遍的。已有研究发现,在某些非晶固体(如:聚合物以及靠近阻塞(jamming)的高密度硬球胶态玻璃)中,剪切硬化效应往往伴随着熵减。然而在我们的模拟研究过程中发现了一种新的现象,那就是伴随着熵增的剪切硬化效应。为了理解这一现象,我们用引力-规范对偶理论构造出了满足非晶固体对称性的有效拉氏量,从而在理论层面解释了这一现象产生的原因,这是其一。其二,不同非晶材料的屈服点与退火(annealing)程度的相关性各不相同。我们的模拟结果给出的二者关系为负相关,这一现象从我们构造出的有效拉氏量也可以定性的给出解释。
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.
## 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*. -->
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