题　目：Forget dark matter ! Where are the atoms ?
报告人：崔伟（清华大学物理系）
时　间：5月3日（周三 ），下午3:30
地　点：同济大学物理馆212

报告摘要：

The Big Bang theory postulates an extremely hot state of the universe about 13.7 billions years ago, when matter exists only in the form of free elementary particles. As the universe expanded, it cooled, resulting in quarks combining to form protons and neutrons and the nucleons subsequently combining to form atomic nuclei. In a matter of minutes after the Big Bang, the universe became too cold to sustain nuclear fusion, so only the lightest isotopes (including deuterium, helium, and lithium) were produced in the process. One of the triumphs of the theory is that the predicted amount of nuclear matter is in agreement with the observations of the universe about a billion years after the Big Bang. In the present-day universe, however, only about half of the matter has been detected. So, where are the missing atoms? I will discuss what they might have happened to them, how we might find them, and what technologies are required. The solution to this long-standing problem will have serious implications on our understanding of the formation and evolution of galaxies like the Milky Way.

个人简介：

1987年毕业于中国科技大学。通过李政道先生主导的CUSPEA项目考试赴美留学。

1994年在美国威斯康星大学麦迪逊分校(University of Wisconsin at Madison)物理系获博士学位。研究生期间的工作主要是围绕着微量能器X射线光谱仪的研发及其在空间天文的应用。毕业后就职于麻省理工学院空间研究中心(Center for Space Research,现Kavli  Institute for Astro-physics and Space Research)，参与了Rossi X-ray Timing Explorer卫星的建造、测试和运行工作，并用该卫星提供的数据开展了一系列黑洞方面的研究。

2000年入职普渡大学物理系(现物理与天文系)，从事高能天体物理和天体粒子物理方面的研究工作。

2011年被聘为中国科学院粒子天体物理重点实验室和高能物理研究所粒子天体物理中心的首席科学家，参与了国内已立项的和正在推动中的一些重大空间项目的实施和规划。

2016年开始在清华物理系天体物理中心任教，并建立了一个低温探测器实验室，主要研制超导转变边缘传感器，为推动宇宙热重子探寻(Hot Universe Baryon Surveyor，简称HUBS)科学卫星项目奠定基础。