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About us
About us
The Theoretical Physics Laboratory at Tokyo Woman's University, a new laboratory established in 2021, conducts research in theoretical physics in a broad sense, of which the current focus is on particle physics and cosmology.
Member List / Research Grants: Oda, Tomiya
📣 Delighted to welcome Akio Tomiya to our team! He is a rising scholar, also known for supervising artificial intelligence studies in “Shin Kamen Rider.”
📣 The first paper with my first graduate student, Mitani-san, at TWCU has been published! (Kin-ya)
M. Haruhi, K. Oda, Decoherence in Neutrino Oscillation between 3D Gaussian Wave Packets, Phys. Lett. B 846 (2023) 138218 [2307.12230] 10 November 2023
Her Master thesis is also published online (though in Japanese):
Haruhi Mitani, Wave-Packet Effects in Neutrino Oscillations, Soryushiron Kenkyu 41 (2023) 1, 7 August 2023.
News
News
Seminars in academic year 2025
Seminars in academic year 2025
Friday, August 4, 2025, 16:35–18:00 (Room 6112)
Koichiro Yasuda (University of California, Los Angeles (UCLA))
Listening to the Whispers of Neutrinos
Neutrinos are elementary particles that hold the key to exploring extreme cosmic phenomena and unknown physical laws. However, they are extremely difficult to detect, and much about where and how they are produced remains a mystery.
In this seminar, I will introduce research that explores the origins of neutrinos emitted from active galaxies. The study reveals a new production mechanism: the photodisintegration of atomic nuclei within jets ejected from supermassive black holes, which lies behind the high-energy neutrinos arriving from active galaxies.
Let’s explore together the extreme phenomena that neutrinos may be hinting at!
ポスター（安田氏）.pdf16:35-18:05, Wednesday 16th July 2025 (Building 6, Room 6112)
Kyoko Tanaka（Tokyo Womans Christian University）The World of Astronomy and Planetary Science
Solid matter is extremely scarce in the universe, yet it plays a crucial role in the formation of stars and planets. Solid particles in space are produced during the final stages of a star’s life cycle, such as in supernova explosions, and are dispersed throughout the cosmos. These solids, known as “presolar grains,” are also found in meteorites; however, their formation processes remain largely shrouded in mystery.
In this presentation, I will introduce the results of research utilizing molecular dynamics simulations to explore the origins of these cosmic solid particles. Furthermore, I will clearly explain how small solid grains formed in space could have ultimately led to the creation of massive planets like Earth.
This scenario will be discussed in the context of recent developments in astronomy and planetary science, incorporating current topics such as “exoplanets,” which are planets found outside our solar system, and the asteroid explorer Hayabusa2. By integrating these cutting-edge themes, the presentation aims to offer an accessible and engaging explanation of the complex processes behind planet formation, beginning with minute cosmic particles.
田中今日子さんスライド（2025.07.16）.pdf16:35-18:05, Wednesday 16th July 2025 (Building 6, Room 6112)
Kyoko Tanaka（Tokyo Womans Christian University）The World of Astronomy and Planetary Science
Solid matter is extremely scarce in the universe, yet it plays a crucial role in the formation of stars and planets. Solid particles in space are produced during the final stages of a star’s life cycle, such as in supernova explosions, and are dispersed throughout the cosmos. These solids, known as “presolar grains,” are also found in meteorites; however, their formation processes remain largely shrouded in mystery.
In this presentation, I will introduce the results of research utilizing molecular dynamics simulations to explore the origins of these cosmic solid particles. Furthermore, I will clearly explain how small solid grains formed in space could have ultimately led to the creation of massive planets like Earth.
This scenario will be discussed in the context of recent developments in astronomy and planetary science, incorporating current topics such as “exoplanets,” which are planets found outside our solar system, and the asteroid explorer Hayabusa2. By integrating these cutting-edge themes, the presentation aims to offer an accessible and engaging explanation of the complex processes behind planet formation, beginning with minute cosmic particles.
16:35-18:05, Thursday 16th January 2024 (Building 6, Room 6210)
Yuji Hirono（Osaka University）
Diffusion model and path integral
In recent years, AI-based image generation technology has been attracting a lot of attention. The technology behind AI, which produces photorealistic images and artistic illustrations, is called “diffusion modeling. This technology is based on a mechanism that gradually blurs and noises an image, and then follows the reverse process to produce a sharper image. In this seminar, we will first explain the basic working principle of the diffusion model. We will also introduce our recent research results on how to formulate and analyze the diffusion model from a new perspective by using “path integral,” one of the formulations of quantum mechanics.
広野-東京女子大.pdf16:35-18:05, Thursday 23th January 2024 (Building 6, Room 6210)
Hayato Kinkawa（Tokyo University）
Fractional quantum Zeno and anti-Zeno effects in open quantum systems
Quantum mechanics taught in undergraduate courses implicitly assumes that a system obeying quantum mechanics does not interact with the outside world at all. However, in reality, such systems receive noise from the outside and humans actively interact with them in the form of “measurements,” and they interact with the outside in an omnipresent way. The field of “open quantum systems” is concerned with such quantum systems that are “open” to the outside world. By repeatedly measuring open quantum systems interacting with environmental systems with infinite degrees of freedom at short time intervals, we have revealed that the time evolution of open quantum systems can be suppressed (quantum Zeno effect) or accelerated (quantum anti-Zeno effect). Although quantum Zeno- and anti-Zeno effects have been discussed by many physicists, the Zeno- and anti-Zeno effects we have discovered are caused by a different physical mechanism from those conventional Zeno- and anti-Zeno effects. In this seminar, we will talk about a new physical phenomenon that occurs because quantum systems are affected by external influences, namely, “measurement” and “interaction with the outside world with infinite degrees of freedom” - the fractional quantum Zeno-anti-Zeno effect.
【金川隼人】東京女子大セミナー.pdf16:35-18:05, Wednesday 16th April 2024 (To be determined)
Mihoko Nojiri（KEK）
TBA
TBA
Preprint submitted
Preprint submitted
H. Kawai, K. Kawana, K. Oda, K. Yagyu, Higgs Alignment from Multicritical-Point Principle in Two Higgs Doublet Models [2404.06096] 9 April 2024
K. Oda, N. Ogawa, Gaussian Formalism: Concrete Realization of Joint Measurement for Heisenberg's Uncertainty Relation for Errors [2403.19440] 28 March 2024
Y. Maitiniyazi, S. Matsuzaki, K. Oda, M. Yamada, Irreversible vierbein postulate: Emergence of spacetime from quantum phase transition [2309.16230] 28 September 2023
H. Kawai, K. Kawana, K. Oda, K. Yagyu, Quantum phase transition and absence of quadratic divergence in generalized quantum field theories [2307.11420] 21 July 2023
K. Oda, J. Wada, Lorentz-covariant spinor wave packet [2307.05932] 12 July 2023
K. Kaneta, K. Oda, M. Yoshimura, Gravitational and dark wave emission at binary merger [2306.07592] 13 June 2023
Yuya Tanizaki, Akio Tomiya, Hiromasa Watanabe, Lattice gradient flows (de-)stabilizing topological sectors [2411.14812] [hep-lat] 22 Nov 2024
Linlin Huang, Mamiya Kawaguchi, Yadikaer Maitiniyazi, Shinya Matsuzaki, Akio Tomiya, Masatoshi Yamada, Functional renormalization group study of a four-fermion model with CP violation : implications to spontaneous CP violation models [2411.07027] [hep-ph] 11 Nov 2024
Yuanyuan Wang, Mamiya Kawaguchi, Shinya Matsuzaki, Akio Tomiya, Implications of electromagnetic scale anomaly to QCD chiral phase transition in smaller quark mass regime: Tpc does not drop with eB [2410.11360] [hep-ph] 15 Oct 2024
Yuki Nagai, Akio Tomiya,JuliaQCD, Portable lattice QCD package in Julia language [2409.03030] [hep-lat] 4 Sep 2024
Yuanyuan Wang, Mamiya Kawaguchi, Shinya Matsuzaki, Akio Tomiya,First-order CP phase transition in two-flavor QCD at θ=π under electromagnetic scale anomaly via a Nambu-Jona-Lasinio description [2502.03879] [hep-ph] 6 Feb 2025
Paper published
Paper published
M. Haruhi, K. Oda, Decoherence in Neutrino Oscillation between 3D Gaussian Wave Packets, Phys. Lett. B 846 (2023) 138218 [2307.12230] 10 November 2023
K. Ishikawa, K. Nishiwaki, K. Oda, New effect in wave-packet scatterings of quantum fields, Phys. Rev. D108 (2023) 096013 [2102.12032] 1 November 2023
K. Ishikawa, O. Jinnouchi, K. Nishiwaki, K. Oda, Wave-Packet Effects: A Solution for Isospin Anomalies in Vector-Meson Decay, Eur. Phys. J. C83 (2023) 978 [2308.09933] 30 October 2023
K. Kaneta, K. Oda, Non-thermal Higgs Spectrum in Reheating Epoch: Primordial Condensate vs. Stochastic Fluctuation, JCAP 10 (2023) 048 [2304.12578] 16 October 2023
K. Kaneta, K. Oda, M. Yoshimura, Constraints on extended Jordan-Brans-Dicke gravity, JCAP 10 (2023) 040 [2304.08656] 12 October 2023
K. Kaneta, H-S. Lee, J. Lee, J. Yi, Misalignment mechanism for a mass-varying vector boson, JCAP 09 (2023) 017 [2306.01291] 7 September 2023
S. M. Lee, T. Modak, K. Oda, T. Takahashi, Ultraviolet Sensitivity in Higgs-Starobinsky Inflation, JCAP 08 (2023) 045 [2303.09866] 18 August 2023
K. Kikuchi, K. Nishiwaki, K. Oda, Gradient-flowed order parameter for spontaneous gauge symmetry breaking, Eur. Phys. J. C03 (2023) 250 [2303.10841] 2 June 2023
K. Kaneta, N. Nagata, K. A. Olive, M. Pospelov, L. Velasco-Sevilla, Quantifying Limits on CP Violating Phases from EDMs in Supersymmetry, JHEP03(2023)250 [2303.02822] 31 March 2023
P. Anastasopoulos, K. Kaneta, E. Kiritsis, Y. Mambrini, Anomalous and axial Z' contributions to g-2, JHEP 02 (2023) 051 [2209.12947] 28 September 2022
K. Kaneta, H-S. Lee, J. Lee, J. Yi, Gauged Quintessence, JCAP02(2023)005 [2208.09229 ] 2 February 2023
K. Asai, J. Fujimoto, K. Kaneta, Y. Kurihara, S. Tsuno, Measuring Lepton Flavor Violation at LHC, Phys. Rev. D 106, 075014 [2112.00930] 1 October 2022
K. Kaneta, S. M. Lee, K. Oda, Boltzmann or Bogoliubov? Approaches Compared in Gravitational Particle Production, JCAP09 (2022) 018 [2206.10929] 6 September 2022
M. Kubota, K. Oda, S. Rusak, T. Takahashi, Double inflation via non-minimally coupled spectator, JCAP06 (2022) 016 [2202.04869] 13 June 2022
Y. Hamada, H. Kawai, K. Kawana, K. Oda, K. Yagyu, Gravitational waves in models with multicritical-point principle, Eur. Phys. J. C82 (2022) 481 [2202.04221] 25 May 2022
M. A. Garcia, K. Kaneta, Y. Mambrini, K. A. Olive, S. Verner, Freeze-in from Preheating, JCAP 03 (2022) 016 [2109.13280] 8 March 2022
S. M. Lee, T. Modak, K. Oda, T. Takahashi, The R2-Higgs inflation with two Higgs doublets, Eur. Phys. J. C82 (2022) 18 [2108.02383] 10 January 2022
K. Oda, J. Wada, A complete set of Lorentz-invariant wave packets and modified uncertainty relation, Eur. Phys. J. C80 (2020) 863 [2007.08141] 20 August 2021
Y. Nagai, A. Tomiya, Lattice gradient flows (de-)stabilizing topological sectors, J. Phys. Soc. Jap. 93 (2024) 114007 [2306.11527] 31 October 2024
L. Huang, Y. Wang, H. Zhang, S. Matsuzaki, H. Ishida, M. Kawaguchi, A. Tomiya, Impact of a local CP-odd domain in hot QCD on the axionic domain-wall interpretation of NANOGrav 15-year data, Phys. Rev. D 109(2024) 11, 115015 [2403.11444] 1 June 2024
Presentations
Presentations
K. Oda, Gaussian formalism: From Heisenberg's Uncertainty Principle to Time-Boundary Effect and Lorentz-Covariant Complete Basis for Spinors, invited talk, TadaFest 2024: Toward understanding of the Origin of Spacetime, iTHEMS, RIKEN, 2 April 2024
K. Oda, Emergence of Spacetime: Gravity through Hidden Local Lorentz Symmetry, invited talk, Kanto-NTU Joint Workshop on String and Field Theory, 15-18, January 2024
K. Oda, Emergence of Spacetime: Gravity through Hidden Local Lorentz Symmetry, Kanto-NTU Joint Workshop on String and Field Theory, 15-18, January 2024
K. Oda, Decoherence of Wave Packets in Neutrino Oscillation, invited seminar, Yokohama National University, Yokohama, Japan, 27 November 2023 (slides)
K. Oda, Decoherence of Wave Packets in Neutrino Oscillation, invited talk, Aso Workshop on Particle Physics and Cosmology 2023, Aso, Japan, 12-15 November 2023 (slides)
K. Oda, Higgs Spectrum Is Non-thermal after Inflation: Primordial Condensate vs Stochastic Fluctuation, 17th International Workshop on the Dark Side of the Universe (DSU 2023), Kigali, Rwanda, 10-14 July 2023 (slides)
K. Oda, Stochastic Higgs fluctuation during inflation: Can it be treated as Bose-Einstein condensate?, short talk at 2nd Intensive Lectures by Quantum Gravity Gatherings, RIKEN, 19 June 2023 (slides)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, invited seminar, KAIST, 22 March 2023 (slide)
K. Kaneta, ボルツマンとボゴリューボフ -重力的粒子生成をめぐって-, invited seminar, Kyushu University, 17 February 2023 (slide)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, invited seminar, RIKEN-iTHEMS, 9 February 2023 (slide)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, invited talk, The 35th Regular Meeting of the New Higgs Working Group, 18 November 2022 (slide)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, invited talk, AstroParticle Symposium 2022 at Institut Pascal, 2 November 2022 (slide)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, contribution talk, Summer Institute 2022, 22 September 2022 (slide)
K. Kaneta, Boltzmann or Bogoliubov? A Case of Gravitational Particle Production, invited seminar, Kavli IPMU, 8 September 2022 (slide)
K. Oda, Standard Model criticality and Higgs inflation, invited lecture, 2022 Summer CAS-JSPS Workshop in Cosmology, Gravitation, and Particle Physics, 30 August - 2 September 2022
K. Oda, Quantum field theory in wave-packet formalism and time-boundary effect, invited seminar, Chuo University, 25 July 2022
K. Oda, intensive lecture at Kobe University, 23 - 27 January 2022
K. Kaneta, Dark Matter Production During Reheating, invited seminar, Chung-Ang University, 7 October 2021 (slide)
K. Oda, 波束形式の場の理論と時間境界効果, invited online seminar, Kyushu University, 28 September 2021
K. Oda, Inflation basics for experimentalists, invited talk, 24th meeting on physics at B factories, 3 September 2021
K. Oda, Dynamically emergent gravity from hidden local-Lorentz symmetry, invited online seminar, Nagoya University, 29 June 2021
K. Oda, New effect in wave-packet scatterings of quantum fields: Saddle points, Lefschetz thimbles, and Stokes phenomenon, invited online seminar, KEK Theory Group, 11 May 2021
A. Tomiya, Machine learning and theoretical physics, invited online talks, JiCFUS meeting, 17 May 2024
A. Tomiya, Let's see inside of ChatGPT, invited online talks, Akita Prefectural Odate Homei High School, 4 July 2024
A. Tomiya, MLPhys in Japan and Developments of CASK: Gauge Symmetric Transformer, invited talks, ML meets LFT, 26 July 2024
A. Tomiya, Developments of CASK: Gauge Symmetric Transformer, talks at Lattice2024, 29 July 2024
A. Tomiya, Machine Learning Methods in Lattice QCD, invited talks, Confinement, 21 August 2024
A. Tomiya, Hands-on for lattice QCD, talks at Lattice summer school 2024, 12 September 2024
A. Tomiya, Machine learning for lattice QCD, talks at Lattice summer school 2024, 13 September 2024
A. Tomiya, Machine learning in lattice gauge theory, invited talks, German-Japan Seminar, 27 September 2024
A. Tomiya, Symplectic integrators in lattice QCD, talks at Analytical Mechanics Mini-workshop, 30 September 2024
A. Tomiya, Let's see Inside of generative AI, invited online talks, Akita Prefectural Odate Homei High School, 9 October 2024
A. Tomiya, Lattice QCD with Machine Learning, invited talks, Physics-of-intelligence-and-machine-learning-2024, 16 October 2024
A. Tomiya, Lattice QCD with Machine Learning, invited talks, 2024 Workshop on Applications of Machine Learning and Artificial Intelligence for Physics and Chemistry Problems, 9 November 2024
A. Tomiya, Why AI study got Nobel prize?, invited talks, TWCU Faculty Union Sponsored Event: "Exploring the Charms of Tokyo Women's University" Research Presentation, 19 November 2024
A. Tomiya, Let's see Inside of generative AI, talks at Yakumo High School, 2 December 2024
A. Tomiya, Gauge Covariant Transformer, invited talks, Lattice Field Theory and Machine Learning, 5
A. Tomiya, Lattice QCD with Julia, talks at Julia in physics 2024, 14 December 2024
A. Tomiya, An introduction to machine learning physics, seminar, 28 August 2024
A. Tomiya, Lattice QCD with Machine learning, seminar, 11 October 2024
A. Tomiya, Lattice gauge theory with transformer, seminar, 6 December 2024
Organization of conferences and workshops
Organization of conferences and workshops
K. Oda, International Organization Committee, 27th International Summer Institute on Phenomenology of Elementary Particle Physics and Cosmology, SUN-LINK-SEA (杉林溪), Nantou, Taiwan, 21-25 August 2023
K. Oda, Local Organizer, Higgs as a Probe of New Physics (HPNP) 2023, Osaka, 5-9 June 2023
K. Oda, Local Organizer, Summer Institute 2022, Fuji-Yoshida, 18-22 September 2022
K. Oda, Organizer, Asia-Pacific Workshop on Particle Physics and Cosmology 2021, online, 2−6 August 2021
A. Tomiya, 格子上の場の理論夏の学校2024, Tokyo, 9-13 September 2024
A. Tomiya, 研究会「2024年ノーベル物理学賞、ノーベル化学賞、AIで自然科学はどう変わったのか、どう変わるのか」, Tokyo, 24 November 2024
A. Tomiya, Julia in Physics 2024, Tokyo, 14 December 2024
A. Tomiya, 計算物理春の学校2025, Okinawa, 10-14 March 2024
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