Dec 7 – 15, 2023
University of Tokyo
Asia/Tokyo timezone

Scope of the workshop

The workshop will focus on compact object binaries ranging from stellar mass objects to supermassive black holes. The workshop aims to discuss our current understanding of gravitational-wave sources based on the previous gravitational-wave and electromagnetic observations and what we will be able to learn from future observations. Topics to be considered at the workshop include:

  • Dynamical channel of binary black hole formation
  • Binary stellar evolution/population
  • Binary black holes in AGNs
  • Intermediate - supermassive binary black hoes
  • Electromagnetic signatures of compact binaries
  • Gravitational-wave data analysis

The workshop is hosted by the Research Center for the Early Universe at University of Tokyo and the Grant-in-Aid for Transformative Research Areas (A): The creation of multi-messenger astrophysics.

Participation and Program

All participants are requested to register by filling out the "Registration" form via the menu on the left of this page. Participants interested in contributing with a talk must also submit an abstract by filling out the "Title of talk" and "Abstract",  in the registration form. The workshop can accept a limited number  of participants due to the capacity of the room.  In order to receive full consideration, all information must be received by October 10th, 2023. 

We plan to focus on invited and contribution talks in the first week. In the second week, we will have a  small number of  talks and  a large fraction of time will be devoted to open discussion. 


The workshop will take place at Science building No. 1 in the Hongo campus of University of Tokyo( Access map to the Hongo Campus from the airports and a link to the Google map).  

Registration fee

We will be collecting the registration and dinner fees at the workshop venue in cash. Please kindly bring some Japanese yen with you. The registration fee is 5000 JPY (~33 USD, 30 EUR).  The cost of each workshop dinner is also 5000 JPY.

Workshop Dinners

The workshop dinners are at

  1. Ensyuya at 19:00 on Dec 8th (In the Asakusa area, ~30min by train. Google map)
  2. Bistro KOZOU at 19:00 on Dec 12th (~15min walk. Google map)


We recommend any business hotel in the Hongo or Ueno area. For example, APA Hotel Keisei Ueno-Ekimae is a business hotel at a walkable distance from UTokyo, just across the Ueno park. Other APA hotels are also nearby (Ueno Eki Minami, Ueno Ekimae, Shin Okachimachi Ekimae). There are many other hotels in the Ueno area.

If you want to stay farther away from the university, commuting by metro is also an easy option. The Hongo campus is well connected to the Marunouchi and Oedo lines (Hongo Sanchome station), the Namboku line (Todaimae st.) and the Chiyoda line (Nezu st.).

For using local transportation, we recommend buying a rechargeable Pasmo (or Suica) card at the airport.

Invited Speakers

  • Clément Bonnerot
  • Chris Belczynski
  • Eric Coughlin
  • Ugo di Carlo
  • Davide Gerosa
  • Zoltan Haiman
  • Kiwamu Izumi
  • Rixin Li
  • Wenbin Lu
  • Lucio Mayer
  • Smadar Naoz
  • Nick Stone
  • Yasushi Suto
  • Stephen Taylor
  • Tejaswi Venumadhav
  • Lieke van Son 


  • Kenta Hotokezaka, University of Tokyo
  • Daniel D'Orazio, Niels Bohr Institute
  • Martin Pessah, Niels Bohr Institute
  • Johan Samsing, Niels Bohr Institute
  • Ataru Tanikawa, University of Tokyo
  • Alessandro Trani, Niels Bohr Institute
  • Kunihito Ioka, Kyoto University
  • Tomoya Kinugawa, Shinshu University


  • Workshop LOC <>


We gratefully acknowledge the support by the Research Center for the Early Universe at University of Tokyo, the Grant-in-Aid for Transformative Research Areas (A): The creation of multi-messenger astrophysics (23H04900), JST FOREST Program (Grant Number JPMJFR2136), and the JSPS Grant-in-Aid for Scientific Research (Grant Number 23H01169).


University of Tokyo
Science Bldg. 1, Hongo Campus 7-3-1, Hongo, Bunkyo, Tokyo