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| === The 102nd REM: someday in September 2019, Friday === ---- * Time: 13:00-14:00 * Speaker: TBA * Title: TBA * [[Link to the material will be here]] === The 101st REM / ISAS Astrophysics Colloquia : August 9th, 2019, Friday === ---- * Time: 13:00-14:00 * Location: Bld.A, 5F Room 1537 in JAXA Sagamihara campus * Speaker: Morio Toyoshima (NICT) * Title: ''"Recent Trends of Space Laser Communications"'' * [[Link to the material will be here]] * 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_101_110)>> |
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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_111_120|111-120th GW-REM talks (2023-)]] . {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 past GW REM talks
The 101-110th REM talks
The 110th REM: December 22th, 2022, Thursday
- Time: 11:00-12:00
- Speaker: Ryudo Tsukizaki (ISAS)
Title: "Introduction to Space Propulsion"
- Abstract:
In this seminar, a wide variety of space propulsion, such as, cold gas thrusts, chemical thrusters, and solar/nuclear electric thrusters will be introduced. The speaker expects discussion with audience on the possibility of the application of his speciality, low-power electric thrusters, such as 30-W gridded ion thrusters and 1-W electrospray thrusters to the gravitational wave detection in space.
- Abstract:
The 109th REM: December 13th, 2022, Tuersday
- Time: 11:00-12:00
- Speaker: Yu Takahashi (NASA Jet Propulsion Laboratory (JPL))
Title: "Navigation around Jovian environment and small bodies"
- Abstract:
Juno entered its extended mission last year after five years of prime mission in the Jovian environment. The Ganymede flyby in July 2021 kicked off the sequence of flybys that lower Juno’s orbital period, allowing for close range observation of Europa in September 2022 and Io in December 2023. We will discuss the design principles of the Juno reference trajectory and the navigation results from the Ganymede and Europa flybys. The second part of the talk will discuss navigation in the small body environment, focusing on the OSIRIS-REx mission. The OSIRIS-REx spacecraft observed particles sporadically ejecting from Bennu’s surface, which could have caused catastrophic damage to the spacecraft and complicated mission operations. However, the same particles turned out to be very fortuitous “instruments” that allowed the radio science team to estimate the gravity field at precision that would otherwise be unachievable. We will discuss our methods to estimate these particles’ trajectories and how they relate to the gravity field and surface environment around Bennu.
- Abstract:
The 108th REM: October 27th, 2022, Thursday
- Time: 11:00-12:00
- Speaker: Satoshi Tanioka (Syracuse University)
Title: "Current status of AlGaAs coatings"
- Abstract:
Thermal noise in high-reflectivity mirror coatings is a limiting factor in ground-based gravitational wave detectors. Reducing this coating thermal noise improves the sensitivity of detectors and enriches the scientific outcome of observing runs. Crystalline gallium arsenide and aluminum-alloyed gallium arsenide (referred to as AlGaAs) coatings are promising coating candidates for future upgrades of gravitational wave detectors because of their low coating thermal noise. In this talk, recent progress in AlGaAs coating research will be presented.
The 107th REM: August 19th, 2022, Friday
- Time: 11:00-12:00
- Speaker: Leo Tsukada (Penn State University)
Title: "Low-latency detection of the gravitational waves from compact binary coalescences"
- Abstract:
Since the first detection of the gravitational wave from a binary black hole, the LIGO-Virgo-KAGRA (LVK) collaboration has detected in total 90 events from compact binary coalescences, establishing the field of gravitational wave astronomy. In addition to shedding light on the properties of compact objects e.g. black holes and neutron stars, the joint observation of such objects together with electromagnetic emission will bring us further enriched insight on nuclear physics and cosmology. Early 2023, the fourth observing run is going to take place and various methods have been extensively developed towards it. Today, I will talk about methods to detect gravitational waves in low latency, which plays a crucial role in so-called multi-messenger astronomy. In particular, this talk will be focused on the methodology of a low-latency detection pipeline, GstLAL. GstLAL can also incorporate the detection method with negative latency, i.e. early warning. I will briefly describe its prospect in the upcoming forth observing run by the LVK collaboration.
- Abstract:
The 106th REM: July 28th, 2022, Thursday
- Time: 11:00-12:00
- Speaker: Masayuki Nakano (LIGO, LLO)
Title: "The status of LLO commissioning for O4"
The 105th REM: June 16th, 2022, Thursday
- Time: 11:00-12:00
- Speaker: Ryosuke Sugimoto (SOKENDAI/JAXA)
Title: "Demonstration of back-linked Fabry-Perot interferometer towards space gravitational wave antenna"
The 104th REM: May 19th, 2022, Thursday
- Time: 11:00-12:00
- Speaker: Shoichi Oshino (ICRR)
Title: "Current status of KAGRA for O4 observation"
- Abstract:
KAGRA is currently undergoing upgrade work in preparation for the fourth phase of international joint observations with LIGO and Virgo scheduled to begin in December 2022. KAGRA has two features: built underground and the mirrors are cooled to low temperatures. These are features that predate the third-generation gravitational wave telescopes that will be built in the future. This presentation will introduce the gravitational wave telescope KAGRA, focusing on upgrading works being done.
The 102nd REM: November 15th, 2019, Friday
- Time: 13:00-14:00
- Location: ICRR, the Kashiwanoha campus (tentative)
- Speaker: Kyohei Kawaguchi (ICRR, University of Tokyo)
Title: "Modeling gravitational waveforms and electromagnetic signals from neutron star binary mergers"
- Zoom connection information
Meeting URL: https://zoom.us/j/5045179604
- password: ask the organizers
The 101st REM / ISAS Astrophysics Colloquium : 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"
- Information for Zoom remote connection
Meeting URL: https://zoom.us/j/5045179604
- password: ask an organizer
Jointly organized with the ISAS Astrophysics Colloquia
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.