Name: MeV–PeV Frontiers: New Perspectives in Gamma-Ray Astronomy and Particle Acceleration
Start: 2025-12-16T09:00:00+09:00
End: 2025-12-18T18:00:00+09:00
Location: Kavli IPMU

MeV–PeV Frontiers: New Perspectives in Gamma-Ray Astronomy and Particle Acceleration

from Tuesday 16 December 2025 (09:00) to Thursday 18 December 2025 (18:00)

Monday 15 December 2025
Tuesday 16 December 2025

09:30 Registration
Registration
09:30 - 10:00
Room: Lecture Hall
10:00 Opening remarks - Tadayuki Takahashi (Univ. of Tokyo) Katsuaki Asano (UTokyo/ICRR)
Opening remarks
- Tadayuki Takahashi (Univ. of Tokyo)
- Katsuaki Asano (UTokyo/ICRR)
10:00 - 10:20
Room: Lecture Hall
10:20 Galactic Cosmic Ray Accelerators up to 1 PeV and beyond - Felix Aharonian (YSU)
Galactic Cosmic Ray Accelerators up to 1 PeV and beyond
- Felix Aharonian (YSU)
10:20 - 11:00
Room: Lecture Hall
11:00 Discovering Galactic PeVatrons with LHAASO - Dmitriy Khangulyan (IHEP (CAS))
Discovering Galactic PeVatrons with LHAASO
- Dmitriy Khangulyan (IHEP (CAS))
11:00 - 11:40
Room: Lecture Hall
11:40 Galactic Stellar-mass Black Holes as Potential PeVatrons. - Shigeo Kimura (Tohoku University)
Galactic Stellar-mass Black Holes as Potential PeVatrons.
- Shigeo Kimura (Tohoku University)
11:40 - 12:20
Room: Lecture Hall
12:20 Lunch Break
Lunch Break
12:20 - 13:20
13:20 Sub-PeV Gamma Rays Observed with Extensive Air Shower Arrays - Kazumasa Kawata (ICRR)
Sub-PeV Gamma Rays Observed with Extensive Air Shower Arrays
- Kazumasa Kawata (ICRR)
13:20 - 14:00
Room: Lecture Hall
14:00 Next-generation CTA observatory: status first results and future exploration of the VHE sky - Ievgen Vovk (ICRR/The University of Tokyo)
Next-generation CTA observatory: status first results and future exploration of the VHE sky
- Ievgen Vovk (ICRR/The University of Tokyo)
14:00 - 14:40
Room: Lecture Hall
14:40 Galactic Cosmic Rays and Diffuse Gamma-rays in Baryon Cycle of Milky Way - Jiro Shimoda (UTokyo)
Galactic Cosmic Rays and Diffuse Gamma-rays in Baryon Cycle of Milky Way
- Jiro Shimoda (UTokyo)
14:40 - 15:20
Room: Lecture Hall
15:20 Tea Break
Tea Break
15:20 - 16:00
16:00 A common four-beam geometry tracing the magnetosphere–wind transition in young pulsars - Paul K. H. YEUNG (ICRR/UTokyo)
A common four-beam geometry tracing the magnetosphere–wind transition in young pulsars
- Paul K. H. YEUNG (ICRR/UTokyo)
16:00 - 16:40
Room: Lecture Hall
16:40 TeV Gamma-Ray Diffuse Emissions in the Galactic Center Region with CTAO LST-1 - Shotaro Abe (ICRR/The University of Tokyo)
TeV Gamma-Ray Diffuse Emissions in the Galactic Center Region with CTAO LST-1
- Shotaro Abe (ICRR/The University of Tokyo)
16:40 - 17:20
Room: Lecture Hall
Wednesday 17 December 2025
10:00 The onset of particle acceleration from MeV measurements - Thomas Siegert (JMU Würzburg)
The onset of particle acceleration from MeV measurements
- Thomas Siegert (JMU Würzburg)
10:00 - 10:40
Room: Lecture Hall
10:40 Opening the MeV Window: From Today's Constraints through COSI and Beyond - Hiroki Yoneda (Kyoto University)
Opening the MeV Window: From Today's Constraints through COSI and Beyond
- Hiroki Yoneda (Kyoto University)
10:40 - 11:20
Room: Lecture Hall
11:20 MeV gamma-ray emissions, occasionally PeV emissions with memory burden by evaporating primordial black holes - Kazunori Kohri (NAOJ/KEK)
MeV gamma-ray emissions, occasionally PeV emissions with memory burden by evaporating primordial black holes
- Kazunori Kohri (NAOJ/KEK)
11:20 - 12:00
Room: Lecture Hall
12:00 Group photo
Group photo
12:00 - 12:10
Room: Lecture Hall

12:10 Lunch Break
Lunch Break
12:10 - 13:00
13:00 Connections between high-energy neutrinos and MeV-energy photons: What will IceCube do once the MeV window opens? - Shigeru Yoshida (Chiba University)
Connections between high-energy neutrinos and MeV-energy photons: What will IceCube do once the MeV window opens?
- Shigeru Yoshida (Chiba University)
13:00 - 13:40
Room: Lecture Hall
13:40 Iron beacon in the sky: Centaurus A gamma-ray emission from excitation and de-excitation of heavy ions - Koichiro Yasuda (UCLA)
Iron beacon in the sky: Centaurus A gamma-ray emission from excitation and de-excitation of heavy ions
- Koichiro Yasuda (UCLA)
13:40 - 14:20
Room: Lecture Hall
14:20 Coronal magnetic activity in nearby Seyfert galaxies - Yoshiyuki Inoue (Osaka University)
Coronal magnetic activity in nearby Seyfert galaxies
- Yoshiyuki Inoue (Osaka University)
14:20 - 15:00
Room: Lecture Hall
15:00 Tea Break
Tea Break
15:00 - 15:40
15:40 A brighter future for TeV astronomy, thanks to the secondary gamma rays and neutrinos - Alexander Kusenko (UCLA and Kavli IPMU)
A brighter future for TeV astronomy, thanks to the secondary gamma rays and neutrinos
- Alexander Kusenko (UCLA and Kavli IPMU)
15:40 - 16:20
Room: Lecture Hall
16:20 The Galactic Centre as a Multi-Messenger Laboratory: Prospects for Astronomical Diagnostics and Cosmic-Ray Propagation Theory - Ellis Owen (RIKEN/ABBL)
The Galactic Centre as a Multi-Messenger Laboratory: Prospects for Astronomical Diagnostics and Cosmic-Ray Propagation Theory
- Ellis Owen (RIKEN/ABBL)
16:20 - 17:00
Room: Lecture Hall
17:00 Bridging thermal and non-thermal phenomena in SNRs by 3D hydro simulations and micro-calorimetric X-ray observations - Herman Shiu-Hang Lee (Kyoto University)
Bridging thermal and non-thermal phenomena in SNRs by 3D hydro simulations and micro-calorimetric X-ray observations
- Herman Shiu-Hang Lee (Kyoto University)
17:00 - 17:40
Room: Lecture Hall
18:20 Banquet
Banquet
18:20 - 20:00
Thursday 18 December 2025
10:00 High-resolution Imaging and Polarization Measurement of Sub-GeV/GeV Gamma Rays with Balloon-borne Emulsion Telescopes GRAINE project - Hiroki Rokujo (Kyushu University)
High-resolution Imaging and Polarization Measurement of Sub-GeV/GeV Gamma Rays with Balloon-borne Emulsion Telescopes GRAINE project
- Hiroki Rokujo (Kyushu University)
10:00 - 10:40
Room: Lecture Hall
10:40 Exploring the MeV Gamma-Ray Sky: Results from SMILE-2+ and the SMILE-3 Project - Yoshitaka Mizumura (ISAS/JAXA)
Exploring the MeV Gamma-Ray Sky: Results from SMILE-2+ and the SMILE-3 Project
- Yoshitaka Mizumura (ISAS/JAXA)
10:40 - 11:20
Room: Lecture Hall
11:20 The GRAMS mission: A Liquid Argon Telescope for MeV Gamma-Ray Astronomy and Dark Matter Searches - Hirokazu Odaka (Osaka University)
The GRAMS mission: A Liquid Argon Telescope for MeV Gamma-Ray Astronomy and Dark Matter Searches
- Hirokazu Odaka (Osaka University)
11:20 - 12:00
Room: Lecture Hall
12:00 Lunch Break
Lunch Break
12:00 - 13:00
13:00 Is the Fornax galaxy cluster hiding its radio sources? - Alvina On (National Center for Theoretical Sciences of Taiwan)
Is the Fornax galaxy cluster hiding its radio sources?
- Alvina On (National Center for Theoretical Sciences of Taiwan)
13:00 - 13:40
Room: Lecture Hall
13:40 Multiwavelength observations of PeVatrons and microquasars - Naomi Tsuji (UTokyo/ICRR)
Multiwavelength observations of PeVatrons and microquasars
- Naomi Tsuji (UTokyo/ICRR)
13:40 - 14:20
Room: Lecture Hall
14:20 Resolving sites of particle acceleration with next-generation high-resolution hard X-ray observatories - Chien-Ting Chen (NASA MSFC/USRA)
Resolving sites of particle acceleration with next-generation high-resolution hard X-ray observatories
- Chien-Ting Chen (NASA MSFC/USRA)
14:20 - 15:00
Room: Lecture Hall
15:00 Tea Break
Tea Break
15:00 - 15:40

15:40 Discussion
Discussion
15:40 - 16:50
Room: Lecture Hall

16:50 Closing remarks
Closing remarks
16:50 - 17:00
Room: Lecture Hall

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