OBJECTIVES

In 2015, a black hole binary was confirmed by gravitational waves, and since it was pointed out that this may be a binary of primordial black holes, many researchers, not only in cosmology and gravity theory, but also in elementary particles and astrophysics, have come to realize the utility of primordial black holes. As a result, primordial black hole research has rapidly developed and expanded in the last 10 years. The motivation for organizing this workshop is to take this opportunity to promote international mutual understanding, build cooperative relationships, and lead to future constructive and cutting-edge international joint research. 

This workshop invites researchers conducting cutting-edge research on various aspects of primordial black holes, providing a forum for in-depth discussion and interaction among researchers. The first workshop in this series was held at Rikkyo University in March 2023, and the second at Nagoya University in October 2024. This meeting is the third in the series. 

DETAILS OF THE 4-DAY WORKSHOP

• Date: 7th - 10th September 2026

• Venue: Conference Room, Tachikawa-Hall, Rikkyo University, Toshima, Tokyo

• Format: On-site only

• We will accept a limited number of contributed talks after the selection process by the SOC.

• No travel or accommodation support will be provided for anyone other than invited speakers.

• Enquiries will only be accepted through the contact form at the bottom.

• The registration will be closed when the number of participants exceeds the capacity of the workshop site.

• Program: Here 

REGISTRATION

• Registration form: TBA  

• Important dates:

30th April: Registration opens

30th June: Deadline for abstract submission

15th August: Deadline for registration
Note that registration may be closed if the number of participants reaches the capacity.

INVITED SPEAKERS

Chiara Animali (U Louvain)

Josu Aurrekoetxea (MIT)

Albert Escrivà (Nagoya U)

Jaume Garriga (U Barcelona)

Shinya Kanemura (Osaka U)

Naoya Kitajima　(Tohoku U)

Kaz Kohri (NAOJ/SOKENDAI/KEK/Kavli IPMU)

Kai Murai (RIKEN)

Luis Padilla (Rikkyo U)

Seong Chan Park (Yonsei U)

Shao-Jiang Wang (Beijing, Inst. Theor. Phys.)

Ying-li Zhang (Tongji U)

ORGANIZERS

Albert Escrivà (Nagoya U)

Tomohiro Harada (Rikkyo U)

Hayami Iizuka (Rikkyo U)

Tsutomu Kobayashi (Rikkyo U)

Luis Padilla (Rikkyo U)

Yuichiro Tada (Rikkyo U)

Takahiro Terada (KMI, Nagoya U)

Shuichiro Yokoyama (KMI, Nagoya U)
Chul-Moon Yoo (Nagoya U)

PREVIOUS WORKSHOP

DPBHF I: https://sites.google.com/rikkyo.ac.jp/dpbhf1/home

DPBHF II: https://sites.google.com/rikkyo.ac.jp/pbhworkshop2/home

SUPPORTED BY

• Rikkyo University International Academic Research Exchange Program

• KMI International Conference Support

• JSPS KAKENHI Grants No. JP24K07027

CONTACT

Contact form: Here 

WARNING

Fraudulent emails may be sent to some participants, pretending to be travel agencies or acting on behalf of the workshop. Please note that no travel agency or outside company will contact participants directly regarding flight or hotel arrangements on behalf of the organizers without prior contact from the organizers. If you receive any suspicious messages, do not reply. All official information will be provided only from the organizers' verified email addresses.