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=== The 102nd REM: November 11th, 2019, Friday === === The 102nd REM: November 15th, 2019, Friday ===

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重力波研究交流会

GW research exchange meeting



Upcoming GW-REMs


The 103rd REM: December



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)


The past GW REM talks


The 101st REM / ISAS Astrophysics Colloquium : August 9th, 2019, Friday



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"

    • 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


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 arXiv:1809.10317

    • 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


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"

    • pdf

  • Zoom connection information


Archives for the past talks





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.

gw_talks (last edited 2023-01-27 10:25:41 by shoichi.oshino)