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*[[gw_talks/what_is|重力波研究交流会とは?]] *[[gw_talks/what_is|What is REM ?]] |
* [[gw_talks/what_is|What is GW REM? (重力波研究交流会とは?)]] * [[#UsefulLinks | Useful Links ]] * [[#HowToAnnouncements | How to receive announcements ]] |
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== 次回以降の重力波研究交流会 == | == Upcoming GW-REMs == |
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=== The 95th REM Mar./sometime/2019, Fri. === ---- * Time: 13:00-14:00 * TBA <<BR>> === The 94th REM Feb./22nd/2019, Fri. === ---- * Time: 13:00-14:00 * Satoshi Tanioka * "Noise In The Mirror" [[Link to the material will be here]] |
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=== 第93回 2018年6月15日(金) === ---- * 時間: 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 接続情報 * Meeting URL: https://zoom.us/j/8678936825 * password: ask the organizers or see the invitation email <<BR>> === 第92回 2018年6月1日(金) === ---- * 時間: 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 |
<<Include(gw_talks/archive_111_120)>> |
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=== 第91回 2017年12月8日(金) === |
== Archives for the past talks == |
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* 場所: eZuce上 * 時間: 13:00-14:00 * Talk:仏坂健太 (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|発表資料]] * eZuce 接続情報 * Title: JGW seminar * Community: KEK Community * Password:なし * 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>> === 第90回 2017年10月20日(金) === ---- * 場所: eZuce上 * 時間: 13:00-14:00 * Talk:宮本晃伸(大阪市立大学)「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 | 発表資料]] * eZuce 接続情報 * Title:Monthly JGW seminar * Community: KEK Community * Password:なし * 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 <<BR>> === 第89回 2017年7月28日(金) === ---- * 場所: 東工大宗宮研 * 時間: 14:00-15:00 * Talk: 上原知幸(防衛大) *「フロリダ大学滞在報告」 [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7003 | 発表資料]] * eZuce 接続情報 * Title:Monthly JGW seminar * Community: KEK Community * Password:なし * Meeting Access Information: *SeeVoghRN Application http://research.seevogh.com/joinSRN?meeting=vsvivIele2IsIvaBaeItas *Mobile App : Meeting ID: 773 6450 or Link: http://research.seevogh.com/joinSRN?meeting=vsvivIele2IsIvaBaeItas |
* 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)]] . {i} [[gw_talks/archive_81_90|81-90th GW-REM talks (2016-2017) ]] . {i} [[gw_talks/archive_71_80|71-80th GW-REM talks (2014-2015) ]] . {i} [[gw_talks/archive_61_70|61-70th GW-REM talks (2013-2014) ]] . {i} [[gw_talks/archive_51_60|51-60th GW-REM talks (2012-2013) ]] . {i} [[gw_talks/archive_41_50|41-50th GW-REM talks (2011-2012) ]] . {i} [[gw_talks/archive_31_40|31-40th GW-REM talks (2010-2011) ]] . {i} [[gw_talks/archive_21_30|21-30th GW-REM talks (2009-2010) ]] . {i} [[gw_talks/archive_11_20|11-20th GW-REM talks (2008-2009) ]] . {i} [[gw_talks/archive_1_10|1-10th GW-REM talks (2007-2008) ]] |
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<<Anchor(UsefulLinks)>> == Useful links == ---- * [[JGWDoc/HowTo/UpLoadE| How to upload presentation materials to JGW doc database]] |
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* [[ZoomHowTo | How to use Zoom]] | |
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=== 第88回 2017年6月23日(金) === ---- |
* [[LCGT/Meeting/EVOJ| Use of EVO remote connection system (written in Japanese) ]] |
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* 場所: 東大安東研 * 時間: 13:00-15:00 * Talk 1: 衣川智弥(東大宇宙線研) *「初代星起源コンパクト連星からの重力波とその特徴」[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6849 | 発表資料]] * Talk 2: 神田展行(大阪市立大学) * 「GWPAW2017 報告」[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6848 | 発表資料]] * eZuce 接続情報 * Title:Monthly JGW seminar * Community: KEK Community * Password:なし * Meeting Access Information: *SeeVoghRN Application http://srn.ezuce.com/joinSRN?meeting=MeMMMu2a28DaDs9n9eDv9e *Mobile App : Meeting ID: 771 7886 or Link: http://srn.ezuce.com/join?meeting=MeMMMu2a28DaDs9n9eDv9e |
* [[howtouseezuce| How to join KEK community in eZuce]] |
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=== 第87回 2017年5月26日(金) === |
<<Anchor(HowToAnnouncements)>> == How to receive the announcements == |
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* 場所: リモート接続 * 時間: 13:00-14:00 * Talk: 八木絢外(プリンストン大学) *「Probing Black Hole Spacetime with Black Hole Ringdown」[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6779 | 発表資料]] * eZuce 接続情報 * Title: Monthly JGW seminar * Community: KEK Community * Password: なし * Meeting Access Information: * eZuce SRN Application http://srn.ezuce.com/joinSRN?meeting=MMMeMn2D2tD9DB9M9BD29M * Mobile App : Meeting ID: 770 5175 or Link: http://srn.ezuce.com/join?meeting=MMMeMn2D2tD9DB9M9BD29M <<BR>> === 第86回 2017年4月28日(金) === ---- * 場所: 東工大宗宮研 * 時間: 13:00-15:00 * Talk 1: 河合誠之(東工大) * 「短いガンマ線バーストは重力波源か」[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/gw_talks?action=AttachFile&do=view&target=170428_GW-shortGRB.pdf|発表資料]] * Talk 2: 山本直樹(慶應大) * 「Geometric control theory for quantum back-action evasion」[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/gw_talks?action=AttachFile&do=view&target=%E9%87%8D%E5%8A%9B%E6%B3%A2%E7%A0%94%E7%A9%B6%E4%BA%A4%E6%B5%81%E4%BC%9A_yokotera_fixed.pdf|発表資料]] * eZuce 接続情報 * Title: JGW monthly seminar * Community: KEK Community * Password: 案内メールを参照ください。 * Meeting Access Information: * eZuce SRN Application http://srn.ezuce.com/joinSRN?meeting=MDMaM82M2IDIDM929tD99D * Mobile App : Meeting ID: 765 8217 or Link: http://srn.ezuce.com/join?meeting=MDMaM82M2IDIDM929tD99D <<BR>> === 第85回 2017年3月3日(金) === ---- * 場所 東大三尾研 * 時間 13:00-15:00 * Talk 1: 柳光孝紀(三尾研M2) * 「Photothermal Common-path Interferometryを用いたMoth eye構造の吸収率測定」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6298|発表資料]] * Talk 2: 池田浩太(三尾研M2) * 「重力波検出器KAGRAのための高出力レーザー光源の高度化」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6301|発表資料]] * Talk 3: 堀場貴裕(三尾研B4) * 「遺伝的アルゴリズムを用いた波面補正によるビーム品質改善法の研究」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6299|発表資料]] * eZuce 接続情報 * Title: JGW monthly seminar * Community: KEK Community * Password: 案内メールを参照ください。 * Meeting Access Information: * eZuce SRN Application http://srn.ezuce.com/joinSRN?meeting=MDMaM82M2IDIDM929tD99D * Mobile App : Meeting ID: 765 8217 or Link: http://srn.ezuce.com/join?meeting=MDMaM82M2IDIDM929tD99D <<BR>> === 第84回 2017年2月17日(金) === ---- * 場所 国立天文台三鷹 * 時間 13:00-15:00 * Talk 1: 諸隈智貴(東大天文) * 「J-GEM: Japanese GW-EM Follow-up Group in Optical, Near-Infrared, and Radio Wavelengths 」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6264|発表資料]] * Talk 2: 山本広大 (京大宇宙物理) * 「地上望遠鏡による太陽系外惑星の撮像観測のための極限補償光学系開発」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6103|発表資料]] * eZuce 接続情報 * Title: JGW monthly seminar * Community: KEK Community * Password: 案内メールを参照ください。 * Meeting Access Information: * eZuce SRN Application http://srn.ezuce.com/joinSRN?meeting=MtM8Ma2u22DiDM9t99Ds9t * Mobile App : Meeting ID: 765 1108 or Link: http://srn.ezuce.com/join?meeting=MtM8Ma2u22DiDM9t99Ds9t <<BR>> === 第83回 2017年1月27日(金) === ---- * 場所 リモート接続 * 時間 13:00-15:00 * Talk 1: 花田英夫(国立天文台水沢) * 「絶対重力計の開発と最近の動向」 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6102|発表資料]] * Talk 2: 山本広大 (京大宇宙物理) * 「地上望遠鏡による太陽系外惑星の撮像観測のための極限補償光学系開発」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6103|発表資料]] * eZuce 接続情報 * Title: JGW seminar * Community: KEK Community * Password: 案内メールを参照ください。 * Meeting Access Information: * eZuce SRN Application http://srn.ezuce.com/joinSRN?meeting=M9MIMi222uD9D89s98DD99 * Mobile App : Meeting ID: 763 5874 or Link: http://srn.ezuce.com/join?meeting=M9MIMi222uD9D89s98DD99 <<BR>> === 第82回 2016年3月4日(金) === ---- * 場所 東工大宗宮研 * 時間 13:00-15:00 * Talk 1: Tjark Miener (東工大M1) * 「Search for new radio pulsars via coincidence in the Einstein@Home and Cornell result databases」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4940|発表資料]] * Talk 2: 和泉 究 (LIGO Hanford) * 「Advanced LIGO の信号校正」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4912|発表資料]] * Seevogh 接続情報 * Title: JGW monthly seminar * Community: KEK Community * Password: 案内メールを参照のこと * Meeting Access Information: . SeeVoghRN Application http://research.seevogh.com/joinSRN?meeting=vsvivIeleDI8IIaDasItas . Mobile App : Meeting ID: 745 4985 or Link: http://research.seevogh.com/join?meeting=vsvivIeleDI8IIaDasItas <<BR>> === 第81回 2016年1月29日(金) === ---- * 場所 東大宇宙線研 * 時間 13:00-15:00 * Talk 1: Kieran Craig (ICRR) * 「Coating mechanical loss, spectroscopy and coating thermal noise」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4773|発表ファイル]] * Talk 2: 樊 星 (東大 浅井研) * 「パルス磁石とFabry-Perot共振器を用いた真空複屈折の探索」[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4774|発表ファイル]] * Seevogh 接続情報 * Title: JGW monthly seminar * Community: KEK Community * Password: 案内メールを参照のこと * Meeting Access Information: * SeeVoghRN Application : http://research.seevogh.com/joinSRN?meeting=MIM9Ms2v28DaDu989tDa9I * Mobile App : Meeting ID: 742 7974 or Link: http://research.seevogh.com/join?meeting=MIM9Ms2v28DaDu989tDa9I <<BR>> == これ以前の重力波研究交流会 == ---- . {i} [[gw_talks/archive_81_90|第81回~第90回重力波研究交流会]] . {i} [[gw_talks/archive_71_80|第71回~第80回重力波研究交流会]] . {i} [[gw_talks/archive_61_70|第61回~第70回重力波研究交流会]] . {i} [[gw_talks/archive_51_60|第51回~第60回重力波研究交流会]] . {i} [[gw_talks/archive_41_50|第41回~第50回重力波研究交流会]] . {i} [[gw_talks/archive_31_40|第31回~第40回重力波研究交流会]] . {i} [[gw_talks/archive_21_30|第21回~第30回重力波研究交流会]] . {i} [[gw_talks/archive_11_20|第11回~第20回重力波研究交流会]] . {i} [[gw_talks/archive_1_10|第1回~第10回重力波研究交流会]] <<BR>> == 暮らしに役立つリンク == ---- * [[JGWDoc/HowTo/UpLoad|資料の upload の仕方]] * [[LCGT/Meeting/EVOJ|EVO遠隔会議システムの使い方あれこれ]] * [[howtouseezuce| How to join KEK community in eZuce]] |
. /!\ 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 [[gw_talks/what_is|this page]]. |
重力波研究交流会
GW research exchange meeting
Upcoming GW-REMs
The past GW REM talks
The 111-120th REM talks
The 120th REM: Jan 11th, 2024, Thursday
- Time: 11:00-12:00
- Speaker: M. Tamaki (ICRR)
Title: "Suspension Control in KAGRA"
- Abstract:
Abstract: Ground-based GW detector uses multi-stage pendulum to suspend the mirror for high vibration isolation ratio. However, control noise of suspension limits the low-frequency sensitivity in KAGRA, though low-frequency region has many strong scientific case. This talk will summarize the suspension control in KAGRA and strategies for suspension control noise reduction.
- Abstract:
- Speaker: M.Yamamoto (Toyama University)
Title: "Study of Parametric Instability in KAGRA"
- Abstract:
Abstract: To obtain high shot noise sensitivity, the gravitational wave detectors need to store high laser power in the arm cavity. However, This high laser power causes a phenomenon called Parametric Instability(PI). PI transfers energy from the fundamental optical mode in the arm cavity to the mechanical modes of the mirror. PI has the potential to be an obstacle to higher sensitivity in the future for KAGRA. I will talk about outline of PI and the current status of PI study in KAGRA.
- Abstract:
The 119th REM: Dec 7th, 2023, Thursday (KAGRA FWG(Future Working Group) + GWREM joint session)
- Time: 9:30-10:10
- Speaker: Marco Meyer-Conde (Osaka Metropolitan University)
Title: "Modern machine learning technics and tools in collaboration with CERN"
- Abstract:
Abstract: Timely detection of stellar binary mergers is of the highest interest in both astrophysics and nuclear physics. The use of machine learning technics and mature software with the support of an international laboratory (CERN) and its computer science division will enhance the possibilities and push the boundaries of astrophysics researches.
- Abstract:
The 118th REM: Oct 19th, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Seiji Kawamura (Nagoya University)
Title: "Optical-spring quantum locking for DECIGO, juggled interferometer, jiggled interferometer, and displacement-noise-free neutron interferometer"
- Abstract:
Abstract: At Nagoya University, we are developing various advanced technologies for future gravitational wave detectors, including optical-spring quantum locking for the space gravitational wave antenna DECIGO, a juggled interferometer, a jiggled interferometer, and a displacement-noise-free neutron interferometer. All of these interferometers aim to enhance low-frequency sensitivity beyond the capabilities of standard detection methods. In this presentation, I will elucidate the fundamental principles of these detection methods and provide an overview of their current status.
- Abstract:
The 117th REM: Aug 17th, 2023, Thursday
- Time: 17:00-18:00
- Speaker: Keiko Kokeyama (Cardiff University)
Title: "History and current shape of the Cardiff group"
- Abstract:
Abstract: Cardiff University Gravitational Wave Exploration Institute has been playing a leading role in gravitational wave physics. History and current shape of the group will be reviewed.
- Abstract:
- Speaker: Abhinav Patra (Cardiff University)
Title: "Introduction to the QUEST and commissioning updates"
- Abstract:
Abstract: The QUantum Enhanced Space-Time (QUEST) experiment is currently being commissioned at Cardiff University. QUEST consists of a pair of co-located tabletop power-recycled Michelson interferometers, each targeting a displacement sensitivity of $2 x 10^{-19}$ m/rtHz at 100 MHz. To achieve this sensitivity, the interferometers utilize high circulating power (10 kW) and squeezing. The main science goal of QUEST is to be sensitive to sub-shot noise stochastic signals. These stochastic signals can be a result of spacetime fluctuations due to quantum gravity, interactions of dark matter with the interferometer optics or ultra-high frequency stochastic gravitational waves.
- Abstract:
- Speaker: Terri Pearce (Cardiff University)
Title: "The Polarisation Phase Camera"
- Abstract:
Abstract: The Polarisation Phase Camera, PPC, is designed to be a non-invasive way of characterising the birefringence of a material. A table top experiment in Cardiff is conducting a proof of principle study of the PPC, with the aim of installing it at the detector sites. I will discuss the motivations, science and status of the experiment.
- Abstract:
The 116th REM: July 27th, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Elenna Capote (Syracuse University)
Title: "Advanced LIGO Detector Commissioning for O4"
- Abstract:
Abstract: Both the LIGO Livingston and LIGO Hanford Observatories have made significant progress in upgrading detector sensitivity in preparation for the fourth observing run. This talk will summarize the various equipment upgrades and detector commissioning efforts performed to achieve the new sensitivity.
- Abstract:
The 115th REM: June 22nd, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Hiroko Tomoda (Tokyo Univ.)
Title: "Optical quantum state generation using waveguide optical parametric amplifiers"
- Abstract:
Abstract: Optical quantum information processing (QIP) using continuous variables (CVs) of quadrature amplitudes, is a promising approach for large-scale QIP because of its high efficiency of operation and measurement. However, there are many issues left about a quantum light source for CV QIP such as its programmability and broadbandness. Hence we now develop a new light source that can programmably output various optical quantum states required for CV QIP, using broadband squeezers of waveguide optical parametric amplifiers (OPAs). Conventionally waveguide OPAs cannot be used for optical quantum state generation due to their large loss. However, low-loss broadband OPAs have been recently developed [APL Photon. 5, 036104 (2020)] and have become essential devices in our experiments. In this talk, I will introduce our experimental setup and results of time-varying output squeezing level using the OPA [Opt. Express 31, 2161 (2023)]. In addition, I will show our research progress in generating single-photon states and Schrӧdinger’s cat states.
- Abstract:
The 114th REM: June 1st, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Hiroki Takeda (Kyoto Univ.)
Title: "Probing scalar polarizations in gravitational waves"
- Abstract:
Scalar polarization modes of gravitational waves, which are often predicted in the context of the viable extension of gravity, have been actively searched. However, couplings of the scalar modes to the matter are strongly constrained by the fifth-force experiments. Thus, the amplitude of scalar modes in the observed gravitational-wave signal is expected to be significantly suppressed compared to that of the tensor modes. In this talk, we will discuss the implications of the experiments in the solar system on the detectability of scalar modes in gravitational waves from compact binary coalescences. We first claim that the energy carried by the scalar modes at the generation is, at most, that of the tensor modes from the observed phase evolution of the inspiral gravitational waves. Next, we formulate general gravitational-wave propagation with full polarizations and point out that the energy flux hardly changes through propagation as long as the background changes slowly compared to the wavelength of the propagating waves. Finally, we show that the possible magnitude of scalar polarization modes, which can be probed by the ground-based gravitational-wave telescopes, is already severely constrained by the existing gravity tests in the solar system.
- Abstract:
The 113rd REM: April 27th, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Chihiro Hirose (Niigata Unv.)
Title: "Alignment Sensing and Control in KAGRA"
- Abstract:
In international joint observation of gravitational waves, it is necessary to increase the simultaneous operation rate of gravitational wave telescopes to measure the direction of arrival of gravitational waves. In Japan's KAGRA, the mirror is suspended by a pendulum for vibration isolation, but the tilt of the mirror causes drift. To stabilize the optical axis, Alignment Sensing and Control (ASC) needs to be introduced. Wavefront sensing is effective in detecting the difference between the resonator axis and the incident optical axis. Also, KAGRA's mirrors are cooled down to 20 K to reduce thermal noise. Therefore, the mirrors are made of sapphire, which has low mechanical loss even at low temperatures. I investigated the effect of birefringence on ASC by measuring Y-arm error signal. I also actually introduced ASC to the arm. In this gravitational exchange meeting I will talk about the effect of birefringence on ASC, and also about ASC for Observation 4 now.
- Abstract:
The 112nd REM: Febrary 28th, 2023, Tuseday
- Time: 17:00-18:00
- Speaker: Kohei Yamamoto (AEI)
Title: "LISA metrology system: Clocks, ranging, and communication"
- Abstract:
The Laser Interferometer Space Antenna (LISA) aims to observe gravitational waves in the mHz regime over its 10-year mission time. LISA will operate laser interferometers between three spacecraft. Each spacecraft will utilize independent clocks, which determine the sampling times of onboard devices called phasemeter to extract the interferometric phases and, ultimately, gravitational wave signals. To suppress limiting laser frequency noise due to time-varying unequal arm lengths, phase signals sampled by each phasemeter must be combined in postprocessing to synthesize virtual equal-arm interferometers with the technique called time-delay interferometry (TDI). The synthesis, in turn, requires a synchronization of the independent clocks in postprocessing. For such on-ground data analysis, additional onboard measurements will be introduced on top of primary phase extractions: intersatellite clock-tone transfer and absolute ranging. The ranging technique also enables intersatellite data communication to ease communication between a ground station and LISA. This talk introduces recent experimental studies of these technologies using a hexagonal optical testbed at AEI Hannover.
- Abstract:
The 111th REM: January 26th, 2023, Thursday
- Time: 11:00-12:00
- Speaker: Hiroki Fujimoto (UTokyo)
Title: "Axion dark matter search with laser interferometry"
- Abstract:
Researches on cosmology and astrophysics have revealed that more than 80% of the matter in the universe consists of an unknown substance, or dark matter. The nature of dark matter is still unknown and many searches have been conducted for various dark matter candidates. Axion-like particles (ALPs) are undiscovered particles that are well-motivated candidates for ultralight dark matter. The interaction between ALPs and photons slightly causes the rotational oscillation of linearly polarized light, and therefore ALP dark matter can be detected by the measurement of the polarization rotation of a laser beam. Recently, some ALP dark matter search experiments using the laser interferometer have been proposed. The basic idea is to use an optical cavity, which can enhance the effective light path and also the duration of the interaction with the ALP dark matter. With this technique, the polarization rotation can be amplified and high-sensitive ALP dark matter search can be conducted. In this talk, I will introduce our interferometric ALP dark matter search experiment: DANCE and the search using the gravitational wave detectors.
- 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
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.