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【The 222nd DoA Colloquium】April 29th by Kuo Liu（SHAO）
Description
Title：Experimenting with gravity using pulsars and supermassive black holes
Speaker：Kuo Liu
Abstract：Pulsars are highly stable celestial clocks and extremely sensitive probes to tiny perturbations in spacetime. In this talk, I will introduce two applications of pulsars to probe our theories of gravity under extreme physical conditions: Detecting low-frequency gravitational waves with a pulsar timing array (PTA), and measuring the properties of the supermassive black hole (Sgr A*) in the center of our Galaxy. I will present the most recent results obtained by the European PTA and the International PTA (IPTA), where we have uncovered the first evidence for the presence of nanohertz gravitational wave. I will also give an update on the ongoing IPTA DR3 project, which aims to construct the most sensitive PTA dataset and achieve the first conclusive detection of gravitational wave background. In addition, I will present an overview of the pulsar searches towards the Galactic Center. This will include the first effort of such in the millimeter wavelength regime, using the Atacama Large Millimeter Array and the Event Horizon Telescope.
Bio:
Dr. Kuo Liu is a research professor at Shanghai Astronomical Observatory, and Deputy Director of the State Key Laboratory of Radio Astronomy and Technology. He received a Bachelor's degree in Space Physics from Peking University in 2007, and obtained his Ph.D. in Astronomy and Astrophysics from the Jodrell Bank Centre for Astrophysics, University of Manchester, UK, in 2012. He then worked as postdoctoral researcher at the Max Planck Institute for Radio Astronomy in Germany from 2011 to 2012, and at the Nançay Radio Observatory affiliated with the Paris Observatory in France, from 2012 to 2014. After these, he worked as a scientific staff at the Max Planck Institute for Radio Astronomy from 2014 to 2023, and returned to China in 2024 through the National Overseas Young Talents Program.
Dr. Liu’s main research areas include radio pulsar astrophysics, high-precision pulsar timing, and gravitational experiments. In June 2023, he and the pulsar-timing-array colleagues around the globe released the first evidence for the presence of gravitational wave background, where he co-led the second data release of the European Pulsar Timing Array (EPTA) collaboration and the high-precision pulsar timing project. Currently, he is co-leading the third data release project of the IPTA. He is also a senior member of the Event Horizon Telescope collaboration who released the first image of black hole by mankind.
Time: 14:00-15:00, 29/April, Tuesday
Venue: Room 506 (Large seminar room), Department of Astronomy
You can also access the colloquium via :
https://www.koushare.com/space/329883/live
Venue: Room 506 (Large seminar room), Department of Astronomy
You can also access the colloquium via :
https://www.koushare.com/space/329883/live
