## Title: *holographic construction of flat bands*
## Reporter: TengJi
| 5.13 | 10.00 AM | 6420 | Cheng-Jie Fu |
## Title: *Lattice Simulations of Inflation*
## Reporter: Cheng-Jie Fu
## Abstract
In this talk, I will introduce a holographic construction of flat bands, by reproducing the symmetry breaking pattern of a rather simple Dirac fermion model at zero chemical potential. Then I will introduce anomalous hall effct under this geometry.
In this talk, I will introduce the first use of lattice simulation in the inflationary phase.
## References
-[arXiv:2011.01194](https://arxiv.org/abs/2011.01194)*Granular Matter as a Gravity Analogue* by *Soumendra Kishore Roy et al*
-[Arxiv:2102.06378](https://arxiv.org/abs/2102.06378)*Lattice Simulations of Inflation* by *Angelo Caravano et al*
I will first review the current status of the Hubble tension and then introduce our chameleon dark energy model as a resolution to the Hubble tension.
Motivated by the gauge problem of induced GWs, we investigate the energy of GWs. In this seminar, I will talk about the gravitational energy in the general relativity, show how to obtain the definition for energy of GWs, and how to solve the gauge problem of induced GWs based on such a definition.
## References
# ITP-CAS Gravity and Cosmology Seminar 2:
# ITP-CAS Gravity and Cosmology Seminar 4:
| Data | Time | Place |
| --- | --- | --- |
| 3.23 | 2.00 PM | On-line |
## Title: *The Secret Higgstory: Cosmological Signals of the Standard Model*
## 报告人:Samuel Passaglia
## 单位:Kavli Institute of Physics and Mathematics of the Universe
| 5.13 | 3.00 PM | 6420 |
## Title: *From merger of primordial black holes to the primordial power spectrum of curvature perturbations*
## 报告人:Yingli Zhang 章颖理
## 单位:School of Physics Science and Engineering, Tongji University 同济大学物理与工程学院
## 摘要:
The history of the Higgs during inflation is the closest point of contact between particle physics and cosmology. This history leads to cosmological signals which dramatically show the union of the Standard Model and Lambda-CDM. Depending on the energy scale of inflation and how quickly the inflaton decays at reheating, the Higgs plays different roles: it can act as a curvaton; it can modulate the decay of the inflaton; and its own decay can change the thermal history of the universe. I will present new insights on these signals. First I will focus on whether Higgs fluctuations can form primordial black hole dark matter when it explores its large-field instability. Then I will show how in our familiar electroweak vacuum the HIggs can set the maximum temperature our universe ever achieved, with important cosmological consequences.
The properties of primordial curvature perturbations on small scales are still unknown while those on large scales have been well probed by the observations of the cosmic microwave background anisotropies and the large scale structure. We propose the reconstruction method of primordial curvature perturbations on small scales through the merger rate of binary primordial black holes, which could form from large primordial curvature perturbation on small scales