Title: Gravitational-Wave Physics from Effective Field Theory Methods
Speaker: Gabriel Luz Almeida
Affiliation: ICTS, University of Science and Technology of China（中国科学技术大学交叉学科理论研究中心）
Time: 16:00-17:00, Wednesday, 4th December, 2024 (UTC+8, Beijing Time)
Venue:Room 1502, Shing-Tung Yau Center, Yifu Architecture Building, Sipailou Campus of Southeast University, Nanjing（东南大学四牌楼校区逸夫建筑馆丘成桐中心1502室）
Inviter: Zhengwen Liu（刘正文）
Abstract:
The detection of gravitational waves from coalescing binaries by the LIGO and Virgo interferometers have not only opened a new observational window into the Universe but also revived interest in the study of the relativistic two-body problem. In particular, in the mid-2000s this problem was reformulated within a field-theoretical framework, being then described as an effective field theory (EFT). In this new framework, the different scales involved in the problem define different dynamical regions: on one hand, the short-scale of potential modes describes the conservative interaction between the two bodies, on the other, the long-distance scales account for gravitational-wave processes. Although at lower orders quantities in these two regions can be separately accounted for, at higher orders gravitational radiation starts to affect the conservative dynamics of the system via radiation-reaction effects. In this talk, after presenting the general scope of this EFT and the role played by the different scales of the problem, I will discuss the recent progress in understanding radiation-reaction effects on the two-body dynamics. Additionally, I will discuss efforts to extend the EFT framework to theories beyond General Relativity.
Bio：
Dr. Gabriel Luz Almeida is currently a postdoc at the Interdisciplinary Center for Theoretical Study, University of Science and Technology of China.