量子论坛第一百二十一讲

报告题目：空间引力波探测器与引力波偏振

报告人：龚云贵教授（华中科技大学）

报告时间：14日上午（周四）10:00

报告地点：量子楼410

报告摘要：

Gravitational waves are perturbations of the metric of space-time and it was discovered by LIGO/VIRGO in 2016. However, six polarizations are possible in gravitational theory, although General Relativity predicts that only two such polarizations, tensor plus and tensor cross are present for gravitational waves. Therefore, to determine the nature of gravity, we need to measure the polarizations of gravitational waves. The fist step is to determine the detector response to different polarizations. We give the analytical formulas for the antenna response functions for the six polarizations which are valid for any equal-arm interferometric gravitational-wave detectors without optical cavities in the arms. The response function averaged over the source direction and polarization angle decreases at high frequencies which deteriorates the signal-to-noise ratio registered in the detector.

报告题目：Charm Baryon Decays with SU(3)F symmetry 利用SU(3)对称性研究粲重子衰变

报告人：耿朝强教授（台湾清华大学）

报告时间：14日下午（周四）4:00

报告地点：量子楼410

报告摘要：

本演讲首先介绍粲夸克的历史并回顾当前粒子物理对于粲重子的研究。然后给出粲重子弱衰变在SU(3)对称性下的有效作用量。之后，讨论粲重子的轻子衰变以及两体和三体的非轻子衰变。最后是总结。