第57回NITEP談話会

Tuesday 7 Oct 2025, 15:00 → 16:30 Asia/Tokyo

日時：10/7(火) 15:00-16:30
場所：E211（大講究室2A）

講師：塚田怜央 (ネバダ大　ラスベガス校)

Title:
A decade of gravitational-wave astronomy in the multi-messenger era: From detections to demographics, and future directions

Abstract:
It has been ten years since the first direct detection of gravitational waves opened an entirely new window onto the universe. Over the past decade, observations of compact binary mergers have not only revealed the astrophysical population of black holes and neutron stars, but also—through joint gravitational-wave and electromagnetic detections—offered transformative insights into nucleosynthesis, astrophysical transients, and cosmology. The recently released fourth Gravitational-Wave Transient Catalog (GWTC-4) has nearly doubled the number of confidently detected signals, providing unprecedented statistical power to probe compact-object demographics.  In this talk, I will review the contents of GWTC-4 and summarize recent findings from current population studies as well as their current limitations . I will also highlight the lack of joint detection of electromagnetic counterparts since the discovery of GW170817. Looking forward, I introduce new approaches that leverages information from the detection pipeline to extract additional insights into each of the problems. 
Finally, I will discuss the prospects for gravitational-wave astronomy and its role in the next phase of multi-messenger astrophysics, as expanding catalogs, improved detectors, and innovative analysis strategies promise to further deepen our understanding of compact objects and the gravitational-wave universe.