30th International Summer Institute on Phenomenology of Elementary Particle Physics and Cosmology (SI2026)

7 Aug 2026, 15:00 → 13 Aug 2026, 14:00 Asia/Tokyo

Fuji Calm

Nobuhiro Maekawa (Nagoya Univ.)

About SI2026

Welcome to the 30th International Summer Institute on the Phenomenology of Elementary Particle Physics and Cosmology (SI2026), which will be held from August 7–13, 2026, at the foot of Mt. Fuji!
The Summer Institute series has been held every summer since 1995.

The purpose of the Summer Institute is to foster communication and discussion among participants on current research, rather than to provide pedagogical lectures for students. Accordingly, the scientific program is deliberately kept relaxed to allow ample time for interaction. We hope that new ideas and research collaborations will be inspired by this institute!

Announcements & Important Deadlines

• The registration page is open. (16th May 2026)
• Deadline of Registration: (19th June 2026 (JST))

Date and Place

• August 7 (Fri) -- 13 (Thu), 2026
• Fuji Seminar House "Fuji Calm" (in Japanese)
  • Araya 1400, Fuji-Yoshida, Yamanashi 403-0006, Japan
  • tel: +81-555-22-5156,   fax: +81-555-23-7988

Topics

Physics beyond the Standard Model, particle cosmology, flavor physics, gravitational waves, string phenomenology, effective field theory, etc.

Invited Lecturers

Alejandro Ibarra (T. U. Munich)
Kazuki Sakurai (Warsaw U.)

Invited Speakers

Motoko Fujiwara (Kyushu U.)
Sang Hui Im (IBS)
Wenqi Ke (U. Minnesota)
Hyungjin Kim (iPhT, Saclay)
Tatsuhiro Naka (Toho U.)
Surjeet Rajendran (Jhons Hopkins U.)
Volodymyr Takhistov (WPI-QUP, KEK)
Po-Yan Tseng (Natl, Tsing Hua U.)
Zhong-Zhi Xianyu (Tsinghua U.)
Hai-Bo Yu (U. C. Riverside)

Sponsors

Asia Pacific Center for Theoretical Physics (APCTP)
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU)
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe  (KMI)
Yokohama National University (YNU)

Local Organizing Committee

• T. Asaka (Niigata U.)
• K. Hamaguchi (U. of Tokyo)
• N. Hiroshima (Yokohama National U.)
• T. Kobayashi (Hokkaido U.)
• J. Kubo (U. of Toyama, MPIK Heidelberg)
• T. Kugo (Kyoto U.)
• N. Maekawa (Nagoya U.) Chair
• S. Matsumoto (Kavli IPMU)
• K. Oda (Tokyo Woman's Christian U.)
• S. Okawa (APCTP)
• T. Shindou (International Christian U.)
• K. Tsumura (Kyushu U.)

International Organizing Committee

• K. Cheung (NTHU)
• C.-R. Chen (NTNU)
• K. Choi (IBS-CTPU)
• C.-S. Chu (NTHU)
• G. Hou (NTU)
• J.E. Kim (Seoul National University)
• P. Ko (KIAS)
• O. Kong (NCU)
• T. Kurimoto (University of Toyama)
• J.S. Lee (Chonnam National University)
• C.-D. Lu (LUCD)
• S.C. Park (Yonsei University)
• M. Spinrath (NTHU)
• M. Tanimoto (Niigata University)
• Q. Wang (Tsinghua University)
• T.C. Yuan (Academia Sinica) 
   

Friday 7 August

15:00 → 18:00 Registration

18:00 → 19:30 Dinner

19:30 → 21:30 Reception

Saturday 8 August

09:00 → 09:15 Session: Opening

09:15 → 10:45 Lecture

09:15 Quantum Information Science for Particle & Collider Physics (Lecture 1/2)

Speaker: Kazuki Sakurai (University of Warsaw)

10:45 → 11:00 Break

11:00 → 12:00 Session

11:00 A Solution to the Hierarchy Problem using Non Linear Quantum Mechanics

Speaker: Surjeet Rajendran

11:40 Light Dark Matter Detection at Torsion Balance

Speaker: Jie Sheng (Kavli IPMU)

12:00 → 12:15 Discussion

12:15 → 13:30 Lunch

13:30 → 15:30 Free Discussion

15:30 → 17:00 Lecture

15:30 Quantum Information Science for Particle & Collider Physics (Lecture 2/2)

Speaker: Kazuki Sakurai (University of Warsaw)

17:00 → 17:15 Break

17:15 → 18:15 Poster flash talk

18:30 → 19:30 Dinner

Sunday 9 August

09:00 → 10:00 Session

09:00 Tripartite Entanglement in Particle Scattering and Decays

Speaker: Kazuki Sakurai (University of Warsaw)

10:00 → 10:15 Break

10:15 → 10:55 Session

10:15 Effective Field Theory Across Scales

Speaker: Motoko Fujiwara (Kyushu University)

10:55 → 12:25 Poster Session

10:55 A Radiative Neutrino Mass Model with Semi-annihilating Boosted Dark Matter

Speaker: Dr Takashi Toma (Kanazawa University)

10:55 Belle II excess and dark matter semi-annihilation

Speaker: Prof. Jongkuk Kim (Kangwon National University)

10:55 Beyond the Starobinsky model after ACT

Speaker: Min Gi Park (Department of Physics, Yonsei University)

10:55 Completely Natural SO(10) GUT

Speaker: Haruto Nakayama (Nagoya University)

10:55 Constraining memory-burdened primordial black holes with graviton-photon conversion and binary mergers

Speaker: Yu Min Yeh (National Tsing Hua University)

10:55 Cosmological Constraints on a Scotogenic Model with an Asymmetric Mediator

Speaker: Seishi Enomoto (Kyushu Sangyo University)

10:55 CP-violation in charm decays in BSM Models

Speaker: Alice Savona (EPFL & University of Tokyo)

10:55 Different Speeds of Light and the Emergence of the Lorentz symmetry

Speaker: Tamon Suehiro (Kavli IPMU, UTokyo)

10:55 Experimental signatures of dark matter electromagnetic interactions

Speaker: Merlin Reichard (KIAS)

10:55 Fast and accurate AI-powered templates for the cosmological bispectrum

Speaker: Jiayi Wu (Tsinghua University)

10:55 Forbidden Dark Matter with Sommerfeld Enhancement

Speaker: Takumu Yamanaka (Osaka University)

10:55 Geometric searches for displaced vertices

Speaker: Ui Min (Tokyo Metropolitan University)

10:55 Lepton number violation signals via Higgs/Z decays into a pair of right-handed neutrinos

Speaker: Prof. Takaaki Nomura (Sichuan University)

10:55 Maximal parameter space of sterile neutrino dark matter with lepton asymmetries

Speaker: Kensuke Akita (University of Tokyo)

10:55 Minimal Majoron Dark Matter

Speaker: Haruto Kitagawa (UTokyo)

10:55 Neutrino Mass Generation and Dark Matter Phenomenology in a Neutrinophilic Dark Matter Model

Speaker: Coh Miyao (Tokyo U. of Science)

10:55 Phenomenology of a pNGB Dark Matter from Gauged U(1)_X Symmetry

Speaker: Junho Kang (Chung-Ang University)

10:55 Probing the trilinear Higgs self-coupling in Higgs boson pair production at multi-TeV muon colliders

Speaker: SooJin Lee (National Tsing Hua University)

10:55 Sommerfeld enhancement in an electroweakly interacting spin-1 dark matter model

Speaker: Tomohiro ABE (Tokyo University of Science)

10:55 TeV-scale unification of light dark matter and neutrino mass

Speaker: Mr Shu-Yu Ho (Academia Sinica)

10:55 Uncovering Long-Lived Doubly Charged Scalars

Speaker: Dr NIVEDITA GHOSH (Kavli IPMU (WPI), UTIAS, University of Tokyo)

12:25 → 13:40 Lunch

13:40 → 15:10 Poster Session

13:40 A Hodge-like Approach to Gauge Field Mode Expansion and Its Relation to the CSDR Method in Non-Abelian Gauge Theory with an $S^2$ Extra Dimension

Speaker: Yuki Honda (Yokohama National University)

13:40 A three-loop radiative seesaw model for dark matter and baryon asymmetry

Speaker: Sora Taniguchi (University of Osaka)

13:40 An Analytic Prescription for t-channel Singularities

Speaker: Ryusei Sato (Yokohama National University)

13:40 Analytic Study of Gravitational Waves from Bubble Collisions in a Supercooled First Order Phase Transition

Speaker: Kuan-Yen Chou (National Tsing Hua University)

13:40 Anomaly-Free Axion-Like Particles

Speaker: Mr Mohammad Aghaie (University of Osaka)

13:40 Aspects of Sommerfeld Enhancement in the light of Halo gamma-ray excess

Speaker: Jeonghwan Park (Yonsei university)

13:40 Decaying MeV Scale Dark Matter, Gamma ray decays at e-e+ threshold.

Speaker: Sean Patrick Kemp (Kavli IPMU)

13:40 Electromagnetic signatures of axion dark matter halos around primordial black holes

Speaker: Junghoon Joh (SungKyunKwan Univ.)

13:40 Explosive production of Higgs particles and implications for heavy dark matter

Speaker: Dr Masato Yamanaka (Hiroshima Institute of Technology)

13:40 Generalization and UV completion of Cho-Maison monopole

Speaker: Fukutaro Miya (University of Osaka)

13:40 Hidden monopoles

Speaker: Wakutaka Nakano (Tokyo Metropolitan University)

13:40 Higgs like inflation in light of ACT data

Speaker: Jeonghak Han (Chung-Ang University)

13:40 MeV-Scale Majoron Dark Matter and Future Detection Prospects with COSI

Speaker: Subaru Fujisawa (The University of Tokyo)

13:40 Relativistic-like behavior of ALPs with non-relativistic momenta

Speaker: Yuma Narita (Tohoku Univ. , TMU)

13:40 Resonant Vector Dark Matter in SU(2) Dark Gauge Theories

Speaker: Sanghoon Lee (Chung-Ang University)

13:40 Search for Long-Lived Dark Photons from Dark Radiation at the LHC

Speaker: Dr Van Que Tran (NCTS, National Taiwan University)

13:40 Spin-discriminating prospects of Higgs portal dark matter at future muon colliders

Speaker: JINHEUNG KIM (KIAS)

13:40 Toward the experimental test of a pseudo-Nambu Goldstone dark matter model

Speaker: Takumi Ishikawa (Tokyo U of Science)

13:40 Two component pseudo-Nambu-Goldstone-boson dark matter

Speaker: Mr Riasat Sheikh (Kyushu University)

15:10 → 16:30 Discussion

16:30 → 17:30 Session

16:30 TBA

Speaker: Prof. Volodymyr Takhistov (QUP, KEK)

17:10 Enhanced Dark Matter Quantum Sensing via Geometric Phase

Speaker: Xiaolin Ma (KEK/QUP)

17:30 → 17:45 Break

17:45 → 18:25 Session

17:45 Machine Learning the Refined de Sitter Conjecture: A No-Scale Supergravity Case Study

Speaker: Hyunjoo Jung (Yonsei University Graduate School)

18:05 Higgs Production Classifier using Weak Supervision

Speaker: Prof. Cheng-Wei Chiang (National Taiwan University)

18:30 → 19:30 Dinner

19:30 → 20:10 Session

19:30 An On-Shell Bootstrap Program of Cosmological Correlators

Speaker: Zhong-Zhi Xianyu (Tsinghua University)

Monday 10 August

09:00 → 18:00 Free Discussion

Tuesday 11 August

09:00 → 10:30 Lecture

09:00 WIMP dark matter (Lecture 1/2)

Speaker: Alejandro Ibarra (Technical University of Munich)

10:30 → 10:45 Break

10:45 → 12:05 Session

10:45 Gravitational Probe of Ultralight Dark Matter

Speaker: Hyungjin Kim (iPhT)

11:25 Nuetrino oscillation due to bosonic dark matter

Speaker: Ankhbayar Tugssaikhan (Sungkyunkwan University)

11:45 Angular momentum of vacuum bubbles in a first-order phase transition

Speaker: Jan Tristram Acuña (National Institute of Physics, University of the Philippines Diliman)

12:05 → 12:10 Poster flash talk

12:10 → 13:20 Lunch

13:20 → 15:20 Free Disucssion

15:20 → 16:50 Lecture

15:20 WIMP dark matter (Lecture 2/2)

Speaker: Alejandro Ibarra (Technical University of Munich)

16:50 → 17:10 Break

17:10 → 17:50 Session

17:10 Why Dark Matter May Have Self-Interactions

Speaker: Hai-Bo Yu (University of California Riverside)

17:50 → 18:00 Discussion

18:00 → 21:00 Banquet

Wednesday 12 August

09:00 → 10:00 Session

09:00 Connecting the baryons to the dark matter of the Universe

Speaker: Alejandro Ibarra (Technical University of Munich)

10:00 → 10:15 Break

10:15 → 11:15 Session

10:15 TAICO project ~ Search for Ultra-Heavy Exotic Particles via Fossil Damage Tracks in Ancient Minerals

Speaker: Tatsuhiro Naka (Toho University)

10:55 Probing the 3+1 neutrino model in the SHiP experiment

Speaker: Seong Moon Yoo (SKKU)

11:15 → 11:30 Break

11:30 → 12:10 Session

11:30 Identifying high energy sources of CP violation and PQ breaking with EDMs

Speaker: Dr Sang Hui Im (IBS CTPU)

12:10 → 13:25 Lunch

13:25 → 15:25 Free Discussion

15:25 → 16:45 Session

15:25 Fine-tuning in inflation: effects, constraints, and case studies

Speaker: Wenqi Ke (University of Minnesota)

16:05 Kinetic isocurvature perturbation

Speaker: Jinn-Ouk Gong (Asia Pacific Centerfor Theoretical Physics)

16:25 Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions

Speaker: Kosei Tomiyama (Tohoku Univ.)

16:45 → 17:00 Break

17:00 → 17:40 Session

17:00 Boltzmann Equation Solver for Thermalization

Speaker: Jong-Hyun Yoon (Chungnam National University)

17:20 Reheating after Axion Inflation and its GW signature

Speaker: Tenta Tsuji (KEK)

17:40 → 18:30 Discussion

18:30 → 19:30 Dinner

20:20 → 21:00 Event

Thursday 13 August

09:00 → 09:40 Session

09:00 Uniform Matrix Product States for Hamiltonian Lattice Gauge Theories: Methods and Applications

Speaker: Kohei Fujikura (YITP, Kyoto University)

09:20 Measurement-induced time operator and its uncertainty relation with energy

Speaker: Naoya Ogawa (Tokyo Woman's Christian University)

09:40 → 09:55 Break

09:55 → 10:35 Session

09:55 Probing Light Higgsinos with Electroweak Precision Measurements at Future e+e- Colliders

Speaker: Natsumi Nagata (University of Tokyo)

10:15 Invisible Higgs interactions at the muon collider

Speaker: Kyu Jung Bae (Kyungpook National University)

10:35 → 11:15 Free Discussion

11:15 → 11:55 Session

11:15 Primordial Black Hole signatures from femtolensing and spectral fringe of Gamma-Ray Bursts

Speaker: Po-Yen Tseng (National Tsing Hua University)

11:55 → 12:15 Session: Closing

12:15 → 14:00 Lunch & Adjourn