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=== The 102nd REM: someday in September 2019, Friday === |
=== The 132nd REM: Jun. 5th, 2025 === |
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| * Time: 13:00-14:00 | * Time: 15:00-16:00 * 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. |
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| * Speaker: TBA * Title: TBA * [[Link to the material will be here]] <<BR>> |
}}} |
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| === The 101st REM / ISAS Astrophysics Colloquia : August 9th, 2019, Friday === ---- * Time: 13:00-14:00 * Location: Room 1537, Bild.A, 5F in JAXA Sagamihara campus * Speaker: Morio Toyoshima (NICT) * Title: ''"Recent Trends of Space Laser Communications"'' * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10526 | a link to the material (password protected)] * Information for Zoom remote connection * Meeting URL: https://zoom.us/j/5045179604 * password: ask an organizer * Jointly organized with [[http://www.isas.jaxa.jp/home/astro_colloq/|the ISAS Astrophysics Colloquia]] |
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=== The 100th REM: July 12th, 2019, Friday === ---- * Time: 13:00-14:00 * Speaker: Shoichi Oshino (ICRR, the University of Tokyo) * Title: ''"A review on BBH formations in N-body simulations"'' * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10440|pdf]] * Abstract: {{{ Since the first gravitational wave was detected by LIGO, several BH merging events have already been observed. However, the process of BBH formation is still unclear. Here, I introduce studies that use N-body simulations to investigate BBH formation by gravitational interactions in star clusters. }}} * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers <<BR>> === The 99th REM: June 14th, 2019, Friday === ---- * Time: 13:00-14:00 * Speaker: Hisaaki Shinkai (Osaka Inst. Tech.) * Title: ''"INO: Interplanetary Network of Optical Lattice Clocks"'' * ref: Int. J. Mod. Phys. D. (2019) https://doi.org/10.1142/S0218271819400029 or [[https://arxiv.org/abs/1809.10317| arXiv:1809.10317]] * [[http://www.oit.ac.jp/is/shinkai/Viewgraphs/201906_GW_INO_shinkai.pdf|slide pdf]] * Abstract {{{ The new technique of measuring frequency by optical lattice clocks now approaches to the relative precision of (\Delta f/f)=O(10^{-18}). We propose to place such precise clocks in space and to use Doppler tracking method for detecting low-frequency gravitational wave below 1 Hz. Our idea is to locate three satellites at one A.U. distance (say at L1, L4 & L5 of the Sun-Earth orbit), and apply the Doppler tracking method by communicating ``the time" each other. Applying the current available technologies, we obtain the sensitivity for gravitational wave with three or four-order improvement (h_{n}\sim 10^{-17} or 10^{-18} level in 10^{-5} Hz -- 1 Hz) than that of Cassini satellite in 2001. This sensitivity enables us to observe black-hole mergers of their mass greater than 10^5 M_\odot in the cosmological scale. Based on the hierarchical growth model of black-holes in galaxies, we estimate the event rate of detection will be 20-50 a year. We nickname "INO" (Interplanetary Network of Optical Lattice Clocks) for this system, named after Tadataka Ino (1745--1818), a Japanese astronomer, cartographer, and geodesist. }}} * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers |
<<Include(gw_talks/archive_131_140)>> |
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=== The 98th REM: May 17th, 2019, Friday === ---- * Time: 13:00-14:00 * Speaker: Federico Paoletti and Irene Fiori (European Gravitational Observatory) * Title: ''"Virgo environmental status"'' * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10215|pdf]] * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers <<BR>> === The 97th REM: May/10th/2019, Fri. === ---- * Time: 13:00-14:00 * Speaker: Tomohiro Yamada (ICRR, University of Tokyo) * Title: ''"Searching solutions to achieve high-Q sapphire blade in Rome"'' * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10180|Presentation material]] * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers <<BR>> === The 96th REM: Apr./5th/2019, Fri. === ---- * Time: 13:00-14:00 * Location: Room 604, Science Building 1, the University of Tokyo * Speaker: Nobuyuki Matsumoto (Tohoku University) * Title: ''"Table-top experiments for fundamental physics based on technology of gravitational-wave detectors"'' * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10031|Presentation material]] * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers <<BR>> === The 95th REM: Mar./22nd/2019, Fri. === ---- * Time: 13:00-14:00 * Location: KAGRA analysis building@Kamioka * Speaker: Lucia Trozzo (ICRR, the University of Tokyo) * Title: ''"Advanced Virgo suspension control"'' * [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9983 | Presentation material ]] * Abstract: {{{ In this talk I will give you an overview of the control strategy adopted on the AdV seismic isolation system (the Superattenuator). I will show you the impact of this strategy on the residual motion of the test masses and the AdV sensitivity curve in the region below 10 Hz at the time of first triple detection of GW. }}} * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers <<BR>> === The 94th REM: Feb./22nd/2019, Fri. === ---- * Location: NAOJ (tentative) * Time: 13:00-14:00 * Speaker: Satoshi Tanioka (NAOJ) * "Noise In The Mirror" * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9861]] * Zoom connection information * Meeting URL: https://zoom.us/j/5045179604 * password: ask the organizers or see the invitation email <<BR>> === 93rd REM: June/15/2018, Fri. === ---- * Time: 17:00-19:00 * Talk 1: Julia Casanueva （INFN - Sezione di Pisa） * 「Lock Acquisition in Advanced Virgo (part 1): Guided Lock, Frequency stabilization and Automatic Alignment」 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8389|Slides]] * Talk 2:Diego Bersanetti （I.N.F.N. - Sezione di Genova） * 「Lock Acquisition in Advanced Virgo (part 2): DC Readout, Noise Subtraction & Automation」 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8390|Slides]] * Zoom connection information * Meeting URL: https://zoom.us/j/8678936825 * password: ask the organizers or see the invitation email <<BR>> === 92nd REM June/1/2018, Fri. === ---- * Time: 10:00-11:00 * Talk: Andrew Matas (University of Minnesota)「Searches for the stochastic gravitational wave background in Advanced LIGO's first observing run」 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8333| Slides]] * Zoom connection * Meeting URL: https://zoom.us/j/8678936825 * password: ask the organizers or see the invitation email <<BR>> === 91st Dec./8/2017, Fri. === ---- * Location: online with eZuce * Time: 13:00-14:00 * Talk:仏坂健太(Kenta Hotokezaka) (Princeton University)「A neutron star merger GW170817 and its EM counterparts」 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7530|material]] * eZuce connection information * Title: JGW seminar * Community: KEK Community * Password:n/a * Meeting Access Information: SeeVoghRN Application http://srn.ezuce.com/joinSRN?meeting=M9MIMi222eD2Di9298DD99 Mobile App : Meeting ID: 781 4378 or Link: http://srn.ezuce.com/join?meeting=M9MIMi222eD2Di9298DD99 <<BR>> === 90the Oct./20/2017, Fri. === ---- * Location: web meeting through eZuce * Time: 13:00-14:00 * Talk:宮本晃伸 (Nobuaki, Miyamoto)（大阪市立大学; Osaka City Univ.）「重力波観測によるPopIII星の存在の間接的証明方法の研究」 * [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7305 | material]] * eZuce connection information * Title:Monthly JGW seminar * Community: KEK Community * Password:n/a * Meeting Access Information: SeeVoghRN Application http://srn.ezuce.com/joinSRN?meeting=MMMeMn2D2tDsDs9a9sD29M Mobile App : Meeting ID: 779 0427 or Link: http://srn.ezuce.com/join?meeting=MMMeMn2D2tDsDs9a9sD29M |
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| * The archives from earlier years are written in Japanese (it is a history!). . {i} [[gw_talks/archive_81_90|91-100th GW-REM talks (2017- )]] |
* Most of the archives for the earlier years are written in Japanese (it is a history!). . {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)]] . {i} [[gw_talks/archive_111_120|111-120th GW-REM talks (2023-2024)]] . {i} [[gw_talks/archive_101_110|101-110th GW-REM talks (2019-2022)]] . {i} [[gw_talks/archive_91_100|91-100th GW-REM talks (2017-2019)]] |
重力波研究交流会
GW research exchange meeting
Upcoming GW-REMs
The 132nd REM: Jun. 5th, 2025
- Time: 15:00-16:00
- 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.