International KEK-Cosmo and APCosPA Winter School 2019, “Primordial Black Hole” 22nd — 24th January 2019 Theory Center, IPNS, KEK, Oho 1-1, Tsukuba 305-0801, Japan

After aLIGO detected the gravitational wave (GW) produced by mergers
of binary black holes (BHs), researchers have aggressively studied the
origin of the BHs with masses of the order of O(10) solar mass. In
addition to astrophysical origins of BHs, one of the attractive
candidates of those massive BHs should be Primordial Black Holes
(PBHs), which were produced in the early Universe, e.g., through
collapses of large curvature perturbation at small scales produced by
inflation, not through normal collapsing stars. In addition to the
candidates of the sources for the GW events, it is exciting that PBHs
can be also whole or in part of dark matter. Therefore, nowadays PBHs
have become common topics to be studied in astrophysics, cosmology and
particle physics.

So far a variety of researches on PBHs have been reported within a
couple of years. For students and young postdocs, it should have been
a challenging task to catch up with recent topics related with
PBHs. Therefore, we organize this school to study the current status
of PBHs.

We ask each lecturer to cover both basic topics and cutting-edge
researches. The number of audiences will be restricted due to the
limited size of lecture rooms. The lecturers can use white boards as
well as projectors, although we may ask the lecturers to mainly give
white-board lectures, as these are easier for audiences to digest, in
particular with regard to equations.

Topics to be discussed:
Mechanisms for Formations of PBHs
Cosmological scenarios to produce PBHs
Observational constraints on PBHs
Astrophysical Black Holes

Invited speakers include:
Tomohiro Harada (Rikkyo U, Japan), “Mechanisms for Formations of PBHs”
Teruaki Suyama (Tokyo Tech, Japan), “Cosmological formation rates of
binary PBHs”
Ryuichi Takahashi (Hirosaki U, Japan), “Gravitational Lensing and BHs”
Kohei Inayoshi (Columbia U, USA), “Pop.III / II stars and binary BH


Workshop attendees:
Aimed at graduate students, and postdocs and junior faculties

Workshop fees
Reception: 1,000 yen
Drinks and snacks: 300 yen

Deadline for the registration
21st December 2018

Registration form and application form for wifi

Covering lodging expenses
We cover lodging expenses for participants who stay at the KEK dormitory
on campus. If you need the support, email to the secretary with writing
your detailed schedule, please.

Ms. Tomoko Numata, Secretary, Theory Center, IPNS, KEK

Room 3 on the ground floor at Kenkyu-Honkan Building on the KEK Tsukuba

Kazunori Kohri (KEK, Chair)
Kunihito Ioka (YITP, Kyoto U)
Satoshi Iso (KEK)
Masahiro Kawasaki (ICRR, U Tokyo)
Ryuichiro Kitano (KEK)
Koutarou Kyutoku (KEK)
Takahiko Matsubara (KEK)
Mihoko M. Nojiri (KEK)
Yuuiti Sendouda (Hirosaki U)
Jun’ichi Yokoyama (RESCEU, U Tokyo)
Chulmoon Yoo (Nagoya U)

Kazunori Kohri (KEK, Chair)
Takuya Hasegawa (KEK)
Nagisa Hiroshima (ICRR, U Tokyo / KEK)
Takafumi Kokubu (Rikkyo U)
Koutarou Kyutoku (KEK)
Takahiko Matsubara (KEK)
Taro Mori (KEK)
Takahiro Terada (KEK)
Sai Wang (KEK)

The KEK Project Research Grant 2018
The KEK Student Program 2018
The JSPS grant (Kiban A) “21cm line observations and future astrophysics
” (JP17H01131)
The MEXT grant “Leading Initiative for Excellent Young Researchers(
The MEXT grant (open applications) on Innovative Area “Theoretical
researches to observe Primordial Black Holes” (JP18H04594)
The MEXT grant on Innovative Area “The origin for the accelerated
expansion of the Universe” A02 (JP15H05889)

Endorsed by
Division of Astrophysics, Cosmology, and Gravitation (DACG), Association
of Asia Pacific Physical Societies (AAPPS)
Asia Pacific Organization for Cosmology and Particle Astrophysics (

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