报告题目：Galaxy-based gravitational wave observatory and its promises
报 告 人：A. Gopakumar 教授（Tata Institute of Fundamental Research）
报告时间：2025年10月31日（周五）下午16:00
报告地点：吃瓜网站
新楼D-505
报告摘要：
Maturing Pulsar timing arrays monitor millisecond pulsars which can be converted into Einstein clocks to search for perturbations due to gravitational waves at nanohertz frequencies. A couple of years ago, independent and coordinated investigations by the established Pulsar Timing Array collaborations strongly indicate that the universe is humming with gravitational radiation — a very low-frequency rumble that rhythmically stretches and compresses spacetime and the matter embedded in it. This stochastic GW signal is consistent with that expected from an ensemble of supermassive black hole binaries, but could also be attributable to more exotic sources.I will describe these efforts from the perspectives of the European and Indian Pulsar Timing Array (EPTA+InPTA) consortia. Possible future directions that should be exciting to both astronomers and physicists will be listed. The need for an Asian initiative to build expertise in GW astronomy, strengthening regional capacity, training, and coordinated follow-up will be highlighted.
报告人简介：
A. Gopakumar works at the Tata Institute of Fundamental Research (TIFR), Mumbai, India, and considers himself a disciple of Profs. Gerhard Schäfer and Mauri Valtonen. His research interests span various aspects of gravitational-wave astronomy. In recent years, his focus has been on Pulsar Timing Arrays (PTAs), and he is one of the founders of the Indian Pulsar Timing Array (InPTA). Together with his younger colleagues, he is actively engaged in expanding PTA science and advocates for closer Asian collaboration on all aspects of gravitational-wave astronomy. He aims to advance persistent multi-messenger gravitational-wave astronomy with supermassive black hole binaries, such as OJ 287, in the coming decades.
邀 请 人：杨涛 教授
