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一周物理讲座(10.11-10.17)

实验帮| 2016-10-11 16:06

一周物理讲座(10.11-10.17)
   一周物理讲座

报告题目:Renyi entropy in AdS/CFT correspondence

报告人:陈斌(教授)

时间:10月13日(周四) 10:00

地点:北京师范大学物理楼106

报告摘要:The AdS/CFT correspondence provides a concrete realization of holographic principle of quantum gravity. It not only opens a new window to study the quantum gravity, but also provides powerful tools to investigate the quantum field theory at strong coupling. The holographic entanglement entropy is a bridge connecting quantum gravity, quantum field theory and quantum information, and it sheds light on various issues in three areas. In this talk, I would like to introduce the holographic Renyi entropy in AdS/CFT, especially in the AdS3/CFT2 correspondence.

报告题目:Ultraluminous supersoft X-ray sources

报告人:Jifeng Liu (NAOC

时间: 10月13日(周四)14:00

地点:清华大学蒙民伟科技南楼S727

报告摘要:While ultraluminous supersoft X-ray sources (ULSs) bear features for intermediate mass black holes or very massive white dwarfs possibly close to Chandrasekhar mass limit, our recent discovery of processing relativistic baryonic jets from a prototype ULS in M81 demonstrate that they are not IMBHs or WDs, but black holes accreting at super-Eddington rates. This discovery strengthens the recent ideas that ULXs are stellar black holes with supercritical accretion, and provides a vivid manifestation of what happens when a black hole devours too much, that is, it will generate thick disk winds and fire out sub-relativistic baryonic jets along the funnel as predicted by recent numerical simulations.

报告题目:Creation of the Hydrogen Maser and the Origin of the GPS

报 告人:Daniel Kleppner(美国科学院院士,麻省理工学院物理系教授,麻省理工学院-哈佛的超冷原子中心副主任)

时间: 10月13日(周四)16:00

地点:清华大学郑裕彤讲堂

报告题目:Time Domain Study in the central 5 pc of the Milky Way's Central Black Hole

报告人:Hui Dong (IAA-CSIC)

时间:10月14日(周五)14:00

地点:清华大学蒙民伟科技南楼S727

报告摘要:Nuclear star clusters have been found in 75\% of local spiral galaxies. They are very compact and massive and seem to co-evolve with central massive black holes. Their origins are still not very clear. Due to its proximity, the Milky Way nuclear star cluster (MWNSC) is a unique lab to study its stellar populations and star formation histories, which help us to understand how MWNSC formed. However, the sample of previous spectrography observations is small. High and extreme spatial variable extinctions limit the use of color magnitude diagram. Instead, we present a time domain study for the central 5 pc of the Milky Way with a four-year baseline HST/WFC3 observations at the F153M (1.53 micron) band. I will give a comprehensive description of the stellar types and variability types of variable stars detected in our catalog and discuss how they can impact our understanding of the stellar populations and then the origin of Milky Way nuclear star cluster. The time domain study of the MWNSC could be an important scientific case for the future Chinese 12 m telescope with large field-of-view.

报告题目:Constrained path Monte Carlo: introduction and recent development

报告人:秦明普(博士)

时间:10月17日(周一) 10:00

地点:北京师范大学物理楼106

报告摘要:In this talk, I will first give a brief introduction of the auxiliary field Quantum Monte Carlo (AFQMC) method. Then I will discuss the minus sign problem and the constrained path Monte Carlo(CPMC) method which was designed to attack the minus sign problem. Finally I will present our recent development, i.e., the self-consistent CPMC method (arXiv: 1608.07154) and show its application in the study of doped Hubbard model. I will conclude by discussing the potential applications of this method and the possibility to further improve it.
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