报告题目: Detecting High-Frequency Gravitational Waves in Planetary Magnetosphere
报告人: 刘滔 教授 （香港科技大学）
报告日期: 6 月 6 日 10:00-11:00
报告地点: 理8 栋学术报告厅 118
摘要：
High-frequency gravitational waves (HFGWs) carry a wealth of information on the early Universe with a tiny comoving horizon and astronomical objects of small scale but with dense energy. In this talk, I will demonstrate that the nearby planets, such as Earth and Jupiter, can be leveraged as a laboratory for detecting the HFGWs [Liu, Ren and Zhang, Phys. Rev. Lett. 132, 131402]. These GWs are then expected to convert to signal photons in the planetary magnetosphere, across the frequency band of astronomical observation. As a proof of concept, I will show the first limits from the existing low-Earth-orbit satellite for specific frequency bands and project the sensitivities for the future more-dedicated detections. The first limits from Juno, the latest mission orbiting Jupiter, are also presented. Thanks to the long path of effective GW-photon conversion and the wide angular distribution of signal flux, the obtained limits are found to be highly encouraging, for a broad frequency range including a large portion unexplored before.
报告人简介：
Dr. Tao Liu's research focuses on particle physics and its connections to astronomy and cosmology. Dr. Liu earned his PhD in Physics from the University of Pennsylvania in 2007. Following this, he held the position of ``McCormick Fellow'' at the Enrico Fermi Institute at the University of Chicago from 2007 to 2010. He then moved to the University of California, Santa Barbara, to continue his postdoctoral research. In 2013, Dr. Liu joined the Hong Kong University of Science and Technology (HKUST) as a junior faculty member and is now a full professor. Currently, he serves as Principal Coordinator for the Hong Kong UGC/RGC Collaborative-Research-Fund project titled ``Dark Matter and the Universe.''