报告人

Andrei Derevianko

单 位

University of Nevada-Reno

报告时间

3月11日9:30

报告地点

三楼会议室

报告题目

Hunting for dark matter with GPS and atomic clocks

报告内容

摘 要

Atomic clocks are arguably the most accurate scientific instruments ever built. Modern clocks are astonishing timepieces guaranteed to keep time within a second over the age of the Universe.  The cosmological applications of atomic clocks so far have been limited to searches of the uniform-in-time drift of fundamental constants. We point out that a transient in time change of fundamental constants (translating into clocks being sped up or slowed down) can be induced by dark matter objects that have large spatial extent, and are built from light non-Standard Model fields. The stability of this type of dark matter can be dictated by the topological reasons. We argue that correlated networks of atomic clocks, such as atomic clocks onboard satellites of the GPS constellation, can be used as a powerful tool to search for the topological defect dark matter. In other words, we envision using GPS as a 50,000 km-aperture dark-matter detector. Similar arguments apply to terrestrial networks of atomic clocks.

报告人

简 介

Andrei Derevianko is teaching quantum physics and related subjects at the University of Nevada, Reno (UNR). He has authored over 100 refereed publications in theoretical physics. He is a fellow of the American Physical Society, Simons fellow in theoretical physics, and a Fulbright scholar.  Among a variety of research topics, he has contributed to the development of several novel classes of atomic clocks and precision tests of fundamental symmetries with atoms and molecules.

报告人

李冀光

单 位

应用物理与计算数学研究所

报告时间

3月11日10:30

报告地点

三楼会议室

报告题目

与核性质相关的原子结构精密计算

报告内容

摘 要

报告人

简 介

Employment：2010. 9 – 2012. 8 Post-doc researcher at Université Libre de Bruxelles (Belgium) working with Prof.Michel R. Godefroid. 2012. 9 – 2013. 6 Post-doc researcher at Lund University (Sweden) working with Prof. Tomas Brageand Prof. Per. Jönsson.2014. 3 – Researcher at Institute of Applied Physics and Computational Mathematics (Beijing,China)

Research Fields:• Investigations of electron correlations and relativistic effects; high-precision calculations of atomic properties including atomic structures, transition probabilities, etc; • Nuclear effects in atoms such as the hyperfine interactions, hyperfine-induced transitions, isotope shifts; • Atoms in magnetic fields, effects of magnetic fields on radiative transition rates and angular distribution of line intensity .