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| === The 130th REM: Apr. 3rd, 2025 === | === The 132nd REM: Jun. 5th, 2025 === |
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| * Speaker: Ignacio Magaña Hernandez (Carnegie Mellon University) * Title: ''"Binary black hole populations and cosmology with gravitational-wave observations"'' |
* Speaker: Alvin Li (U Tokyo, RESCEU) * Title: ''"Gravitational Wave Lensing: Current Status and Future Prospects"'' |
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| Since the first detection of gravitational waves (GWs) from the merger of two stellar-mass black holes in 2015, the LIGO-Virgo-KAGRA (LVK) Collaboration has accumulated over 90 observations of mergers involving neutron stars and black holes. With upcoming observing runs for the LVK network of GW detectors, many more binary mergers are expected to be detected. The increasing size of gravitational wave catalogs has enabled the study of their population and its cosmic expansion history. In this talk, I will discuss the latest constraints on the BBH population, focusing on models that search for astrophysical subpopulations driven by various formation channels with both parametric and fully data-driven methods. Then, I will explain how the BBH mass spectrum can be used as a calibrating scale to measure cosmology—providing a GW data-only way to do cosmology. Lastly, I will demonstrate how using galaxy survey information as a prior on potential galaxy hosts for BBH mergers can improve our cosmological measurements. | 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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One has to subscribe to the mailing list called gw_comm in order to receive our announcement emails. Please ask one of our organizers for subscription. The organizers can be found in this page.