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| === The 128th REM: Feb. 6th, 2025 === | === The 132nd REM: Jun. 5th, 2025 === |
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| * Speaker: Anarya Ray (Northwestern University) * Title: ''"Population Properties of Merging Compact Binaries: Astrophysical Implications and Source Classification"'' |
* Speaker: Alvin Li (U Tokyo, RESCEU) * Title: ''"Gravitational Wave Lensing: Current Status and Future Prospects"'' |
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| In the era of growing gravitational wave (GW) catalogs and multi-messenger astronomy, understanding the ensemble properties of merging compact binaries is of fundamental importance. Constraining phenomenologically parametrized and flexible models for the population-level distributions of compact object parameters from GW data will reveal key insights into the uncertain astrophysical mechanisms of compact binary formation. Moreover, specific classes of systems—such as binary neutron stars (BNSs), binary black holes (BBHs), and neutron star–black hole (NSBH) binaries—are expected to exhibit distinct population properties. Constraining these properties can, in turn, facilitate source classification, a crucial step in optimizing the search for multi-messenger counterparts to GW signals from BNSs and NSBHs. In this talk, I will discuss GW population inference and its astrophysical implications, with a focus on data-driven methods and findings from the third GW transient catalog. Additionally, I will explore how knowledge of population distributions can be leveraged to classify compact binary merger systems in real-time, thereby optimizing the search for multi-messenger counterparts, which are expected predominantly from neutron star-containing mergers. I will conclude with a discussion on the future prospects of these investigations, including a self-consistent approach to population inference and source classification, in the context of upcoming observing runs of ground-based GW detectors. |
Gravitational lensing of gravitational waves offers a unique opportunity to probe both astrophysical and cosmological phenomena, from the population properties of compact binaries to the distribution of matter in the Universe. As gravitational waves travel through the Universe, their paths can be deflected, and their amplitudes can be (de)-magnified by intervening massive structures. This leads to various observable signatures, including magnification bias, arrival time delays, and repeated signals. In this talk, I will present an overview of gravitational wave lensing, beginning with the theoretical foundations and the classification of lensing regimes relevant to ground-based detectors. I will review the status of current searches for lensed gravitational wave events, highlighting recent results from the third observing run (O3) of the LIGO-Virgo-KAGRA collaboration. In addition, I will discuss the various methods employed in lensing analyses and the challenges associated with confidently identifying lensed events. I will then outline the prospects for detecting gravitational wave lensing in upcoming observing runs and the potential scientific returns such detections could offer. I will also discuss the specific contributions KAGRA can make in making the first lensed gravitational wave detection. |
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| . {i} [[gw_talks/archive_121_130|121-130th GW-REM talks (2024-)]] | . {i} [[gw_talks/archive_131_140|131-140th GW-REM talks (2025-)]] . {i} [[gw_talks/archive_121_130|121-130th GW-REM talks (2024-2025)]] |
重力波研究交流会
GW research exchange meeting
Upcoming GW-REMs
The 132nd REM: Jun. 5th, 2025
- Time: 11:00-12:00
- Speaker: Alvin Li (U Tokyo, RESCEU)
Title: "Gravitational Wave Lensing: Current Status and Future Prospects"
- Abstract:
Gravitational lensing of gravitational waves offers a unique opportunity to probe both astrophysical and cosmological phenomena, from the population properties of compact binaries to the distribution of matter in the Universe. As gravitational waves travel through the Universe, their paths can be deflected, and their amplitudes can be (de)-magnified by intervening massive structures. This leads to various observable signatures, including magnification bias, arrival time delays, and repeated signals. In this talk, I will present an overview of gravitational wave lensing, beginning with the theoretical foundations and the classification of lensing regimes relevant to ground-based detectors. I will review the status of current searches for lensed gravitational wave events, highlighting recent results from the third observing run (O3) of the LIGO-Virgo-KAGRA collaboration. In addition, I will discuss the various methods employed in lensing analyses and the challenges associated with confidently identifying lensed events. I will then outline the prospects for detecting gravitational wave lensing in upcoming observing runs and the potential scientific returns such detections could offer. I will also discuss the specific contributions KAGRA can make in making the first lensed gravitational wave detection.
- Abstract:
The past GW REM talks
The 131-140th REM talks
The 131st REM: May. 19th, 2025
- Time: 15:00-16:00
- Speaker: Naoki Aritomi (U Tokyo)
Title: "Advanced LIGO detector performance in the fourth observing run"
- Abstract:
I will talk about the LIGO detector performance in O4 based on the recently published paper, Phys. Rev. D 111, 062002 (2025).
- Abstract:
Archives for the past talks
- Most of the archives for the earlier years are written in Japanese (it is a history!).
Useful links
How to receive the announcements
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