Seminar:- Pulsar Timing Array Consortia Yield Evidence of Cosmic Gravitational Wave Background
Very recent 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. For these IPTA-endorsed 3P+ efforts, the European and Indian Pulsar Timing Array consortia, namely EPTA and InPTA, pooled together their resources that included combining EPTA’s second data release and InPTA’s first data release. These efforts allowed the speaker and his team to probe and characterize the contributions of instrumental noise and interstellar propagation effects that are present in the various combinations of their pulsar data sets. The resulting detailed investigations reveal strong evidence for the presence of a stochastic gravitational wave background. The speaker will share the excitement of their InPTA collaboration which is an Indo-Japanese effort that employs niche abilities of India’s upgraded Giant Metre wave Radio Telescope(uGMRT).
地點：香港中文大學 科學館北座 G25室
講者：Prof. Achamveedu GOPAKUMAR (Tata Institute of Fundamental Research, India)