MEASURING STORMS IN SPACE-TIME: ASTRONOMY WITH GRAVITATIONAL RADIATION

主讲人 (Speaker): 
Dr Robert Ward
主讲人单位 (Speaker's Institute): 
澳大利亚国立大学
邀请人 (Invited by): 
胡一鸣
时间 (Time): 
星期一, 2017/09/18 - 15:00 to 16:00
地点 (Location): 
珠海校区行政楼八楼天琴中心大会议室
摘要 (Abstract): 

The age of gravitational wave astronomy has dawned: we now have a new form of radiation with which to study the Universe. On September 14, 2015, the Laser Interferometer Gravitational Wave Observatory (LIGO) detectors recorded the first direct observation by humankind of gravitational waves -- space-time distortions generated by objects with extreme gravity. These waves propagate over astrophysical distances and can be detected by the modulation imposed on the optical path of a suspended mirror laser interferometer. Modern laser interferometric gravitational wave detectors are giant, broadband opto-mechanical sensors that explore the audio spectrum from 1 Hz to 10 kHz. This entire frequency band is expected to contain signals from dynamical astrophysical processes of great interest, such as the inspiral and merger of compact objects, stellar core-collapse supernovae, spinning neutron stars and various astrophysical backgrounds. Even more tantalising are the unpredicted sources. I will discuss gravitational waves and the technology developed to detect them. I will describe what we have observed so far, what we hope to learn about the universe with this new astronomical messenger, and the research program at the Australian National University aiming to expand the horizons of gravitational wave detectors by attacking the limiting noise sources, of fundamental and technical origin.

 

 

主讲人简介 (Speaker's CV): 
Robert Ward has been working to detect gravitational waves since 2003, when he joined the Laser Interferometer Gravitational Wave Observatory (LIGO) lab as a PhD student at the California Institute of Technology.  There he worked at the 40m interferometer, prototyping the Advanced LIGO and searching for a stochastic background of gravitational waves. From Caltech he went to the Astroparticle and Cosmology Laboratory (APC) in Paris, where he carried out the optical design for the Advanced Virgo gravitational wave detector.  He is now a Research Fellow in the Centre for Gravitational Physics at the Australian National University.  At the ANU, his work includes technology development for gravitational wave detection, precision measurement in space/satellite technology, and the development of methods and techniques for space debris tracking and mitigation. He is an author of over 116 peer reviewed publications.