Toward clarification of the History of the Universe
Why our Universe was bone and how it developed into the present state? Since its birth at the Big Bang, the Universe has experienced various drastic events. Because the Universe is not a stable object, we have to understand and explain the present state as a consequence of dynamical processes the Universe has experienced. Though many events in the History of the Universe have been clarified, many pieces are still missing to understand our Universe today.
Tomonaga Center for the History of the Universe (TCHoU) was founded in October 2017 as a research center at the University of Tsukuba. The mission of the Center is to clarify the genesis of the Universe as well as the origin of matter and life and to construct an integrated view of the History of the Universe, through international and interdisciplinary collaboration of particle, nuclear, and astrophysics as well as resonant cooperation of experimental and theoretical approaches.
Toward this goal, the center has established the following four research divisions:
- Division of Antarctic Astronomy
- Division of Elementary Particles
- Division of Quark Nuclear Matters
- Division of Photon and Particle Detectors
Please visit
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[About the Center] for an overview of the Center.
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[Projects] for the research projects of the Center.
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[Organization] for the organization and members of the Center.
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[Materials] for reports and introductory materials.
The name Tomonaga Center comes from Dr. Sin-Itiro Tomonaga, the second Nobel Laureate from Japan, who made fundamental contributions in constructing relativistic quantum field theories, the renormalization theory, theory of collective motions, etc. and also a founder of the physics institute at Tsukuba.
Visit Tomonaga Memorial Room, Univ. Tsukuba and Tomonaga Exibition at the University of Tsukuba Gallery for more information about Dr. Tomonaga.
(Photo: Tomonaga Memorial Room)
What's new
- 2025/06/29 Tanabata Lecture of Astronomy
Lectures by astronomers will be held near Tanabata Day. The state-of-the-art research content will be explained in an easy-to-understand manner to the general public. (in Japanese)
Click on the poster for details.
- Date： 29 June (Sunday) 13:30－16:30
- Venue: Tsukuba International Congress Center EPOCHAL, Conference room 101
- Target: General public (junior high school students and above)
- Participation fee: Free
- Program
13:30 Erika Ogata (Univ. Tokyo) "Unveiling the Evolution of the Universe and Black Holes through Simulations" 15:00 Shunsuke Honda (Univ. Tsukuba) "Astronomers on the Antarctic Expedition: The Challenges of a Polar Mission" 16:30 End
Contact: Prof. N. Kuno (TEL: 029-853-5080)
- 2025/04/05 The 2025 Breakthrough Prize in Fundamental Physics was awarded to ATLAS and ALICE Collaborations
The 2025 Breakthrough Prize in Fundamental Physics was awarded co-authors of publications based on CERN’s Large Hadron Collider Run-2 data released between 2015 and July 15, 2024, at the experimental collaborations ATLAS, CMS, ALICE and LHCb. They carried out detailed measurements of Higgs boson properties confirming the symmetry-breaking mechanism of mass generation, the discovery of new strongly interacting particles, the study of rare processes and matter-antimatter asymmetry, and the exploration of nature at the shortest distances and most extreme conditions at CERN’s Large Hadron Collider.
Members of the Division of Elementary Particles and the Division of Quark Nuclear Matters, TCHoU, have been deeply involved in the ATLAS and ALICE experiments, respectively, from their start-ups.
Visit also TSUKUBA JOURNAL, CERN news, ATLAS press statement, and ALICE announcement for more information.
- 2025/04 Member lists and pamphlets of the TCHoU have been updated.
- 2025/03/14 TCHoU Workshop by the Division of Elementary Particles
TCHoU Workshop of AY 2024 on Particle Physics, organized by the Division of Elementary Particles, is held as follows. This workshop is free to access. Talks are given in Japanese.
- Date: March 14 (Fri), 2025 13:30-15:35
- Venue: D312, Natural Sci. Bldg. D, Univ. Tsukuba
- Program:
Contact: Asso.Prof. Y. Takeuchi
- 2025/03/08-09 International workshop "The 2nd Workshop Highly Baryonic Matter at RHIC-BES and Future Facilities"
The 2nd Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities --- beyond the Critical Point towards Neutron Stars --- (WHBM2025) will be held at University of Tsukuba on March 8-9 (Sat-Sun), 2025 in order to discuss about our current understandings and future directions of researches on Quark Gluon Plasma (QGP) and QCD phase diagram, especially related to the first order phase transition and the critical end point, that are expected at high baryon density region in the phase diagram. The main topics to be discussed in the workshop would be on collective flow, vorticity, imaging, correlation, fluctuation and their experimental and theoretical challenges for clarifying the QCD phase structure and the high-density quark-nuclear matter from intermediate- to high-energy heavy-ion collisions in on-going programs at LHC and RHIC beam energy scan as well as future directions at FAIR, LHC/SPS, RHIC/AGS, HIAF and J-PARC etc.
Details of the workshop including the registration form can be found at the website below.
- Date: Mar. 08-09, 2025 (Sat-Sun) 8:30-17:30
- Venue: Advanced Research building-B, Room 0110, Univ. Tsukuba
- URL: https://kds.kek.jp/event/53510/ ( https://kds.kek.jp/e/whbm2025)
- You need to type in the access keyword that you see on the screen, to enter the web site.
Contact: Prof. S. Esumi
- 2025/02/06 The astronomy project at Dome Fuji in Antarctica has finally begun!
The Division of Antarctic Astronomy is planning to install a 30cm submillimeter telescope at Dome Fuji inland of Antarctica to clarify the evolution process of interstellar gas in the Milky Way. This year, two members have joined the dome team and have begun preparations on-site. Next year, we will finally send the telescope to Antarctica.
(photo by S.Honda)Visit NIPR Research Team Blog https://nipr-blog.nipr.ac.jp/jare/20250128post-552.html (in Japanese) for more information.
- 2025/01/07 HoU seminar
- Date： Jan. 07, 2025 (Tue) 16:15-17:15
- Venue: B118, Natural Science Bldg. B, Univ. Tsukuba
- Speaker: Marco Bomben (APC & Université de Paris, Cité)
- Title: "TCAD simulations of silicon sensors for High Energy Physics"
- Technology computer-aided design (TCAD) simulations are a fundamental tool in the micro-electronics industry. TCAD tools allow to simulate both processed and device behaviour. TCAD simulations are crucial for the development of silicon sensors for high energy physics (HEP) too, allowing to reduce the number of submissions by studying in advance the performance of proposed layout and geometries of future detectors. In this talk I will present some highlights of my work on TCAD simulations, with focus on the possibility to have insight into quantities otherwise unaccessible like electric field and carrier concentration and velocity. I will also show how results from TCAD simulations can be used as input for more high-level MonteCarlo simulations.
Contact: Assi.Prof. S. Hirose
- 2024/12/26 S. Hirose received the AAPPS-JPS Award
Assi.Prof. Shigeki Hirose (Div. of Elementary Particles) received The 3rd (2025) AAPPS-JPS Award for his experimental study of the Higgs sector using the tau lepton as a probe.
In order to promote research on Physics in the Asian region, JPS and AAPPS (Association of Asia Pacific Physical Societies) jointly award AAPPS-JPS Award for young JPS members who achieve outstanding research results in this regard.
- 2024/12/16 2nd TCHoU Research Member Meeting / Activity and Achievement Reports for FY2024
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU.
- Date: 16 Dec 2024 (Mo)
- 9:30-10:30 Research Member Meeting, 10:30-16:25 Activity and Achievement Reports
- Venue: CRiES Advanced Accelerator Section, 3F Auditorium
- Program:
- Click on the title for the presentation slide.
- Number of participants: about 20
Contact: Prof. N. Kuno
- 2024/10/04 HoU seminar
- Date： Oct. 04, 2024 (Fri) 13:45-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Keita Mizukoshi (JAXA/ISAS)
- Title: "Search for dark matter using a long-duration orbiting balloon in Antarctic'"
- Despite the evidence for dark matter as an unknown particle inferred from astronomical observations, its true nature remains elusive. While direct searches using xenon dual-phase detectors have yielded significant results, they are approaching the detection limit due to neutrino background events. On the other hand, indirect detection experiments are crucial as they can directly test the thermal production model of dark matter, making them complementary to other search methods. Additionally, cosmic antiparticles (such as antiprotons) originating from dark matter are expected to allow background-free searches in the low-energy region, meaning that the detection of even a single antiproton could provide critical information about the nature of dark matter.
The GAPS experiment plans to conduct its search in the upper stratosphere over Antarctica using a helium balloon, in order to avoid the effects of the atmosphere and geomagnetism. A flight lasting about one month, carrying a payload of approximately 2 tons equipped with a silicon detector array and TOF scintillators, is scheduled for this December. In this seminar, we will provide a detailed explanation of the indirect detection of dark matter, the GAPS experiment, and the unique aspects of balloon experiments. - Number of participants: 25
Contact: Assi.Prof. T. Iida
- 2024/09/30 Tsukuba Global Science Week (TGSW) 2024 "Universe Evolution and Matter Origin"
As the Session 4-1 of the Tsukuba Global Science Week, TCHoU is organizing the International Workshop on "Universe Evolution and Matter Origin" as an on-line workshop.
In order to answer various questions in basic natural science especially about the evolution of the universe and the origin of matter, University of Tsukuba has founded the "Tomonaga Center for the History of the Universe" (TCHoU). TCHoU includes the following four divisions; (1)Antarctic Astronomy, (2)Elementary Particles, (3)Quark Nuclear Matters, and (4)Photon and Particle Detectors. These 4 divisions are trying to cooperate together to shed light on the "dark-" matter, energy and galaxies, toward understanding the origin of matter, phase transition and structure formation as well as their fluctuation and evolution in our Universe. This session is to share the understanding of our fields and to discuss about the next step.
- Date: Sept.30, 2024 (Mon) 15:00-21:00
- Venue: Online
- URL: TGSW : Session 4-1 "Universe Evolution and Matter Origin"
- Program:
15:00-15:05 Fumihiko Ukegawa TCHoU, Univ. Tsukuba Opening 15:05-15:50 Lijuan Ruan BNL Recent results from STAR experiment at RHIC-BNL 15:50-16:35 Tetyana Galatyuk TU Darmstadt/GSI Probing cosmic forms of matter in the laboratory 16:35-17:20 Yuhu Zhang IMP Precision mass measurements of short-lived nuclei at heavy ions storage ring in Lanzhou 17:30-18:15 Wen Yin Tokyo Metropolitan Univ. Neutrino, dark matter, and new physics 18:15-19:00 Shigeki Hirose TCHoU, Univ. Tsukuba Unraveling the mysteries of the Universe through Higgs: now and future of the energy frontier 19:10-19:55 Satoki Matsushita Inst. Astronomy and Astrophysics,
Academia SinicaGreenland Telescope (GLT): Imaging the Black Hole Shadow and the Photon Ring 19:55-20:40 His-An Pan Tamkang Univ. Neutrino, dark matter, and new physics 20:40-20:50 Nario Kuno TCHoU, Univ. Tsukuba Closing - Number of participants: about 20
Please click on the title for the presentation slide.
Contact: Prof. Akira Ozawa
- 2024/09/23 HoU seminar
- Date： Sept. 23, 2024 (Fri) 11:00-
- Venue: 1F201, !st Cluster Bldg. 1F, Univ. Tsukuba / Zoom
- Speaker: Nu Xu (LBNL/IMP)
- Title: "Study of the QCD Phase Structure - Recent Results from RHIC Beam Energy Scan Program"
Contact: Prof. S. Esumi
- 2024/08/30 HoU seminar
- Date： Aug. 30, 2024 (Fri) 13:45-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Hiroshi IMAI (Kagoshima University)
- Title: "On the 'Stellar Water Fountains/Geysers'"
- Number of participants: 20
Contact: Prof. N. Kuno
- 2024/07/12 HoU seminar
- Date： Jan. 19, 2024 (fri) 13:45-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Ashutosh KOTWAL (Duke University, USA)
- Title: "High-precision measurement of the W boson mass with the CDF II detecto"
- The mass of the W boson, a mediator of the weak force between elementary particles, is tightly constrained by the symmetries of the standard model of particle physics. The Higgs boson was the last missing component of the model. After observation of the Higgs boson, a measurement of the W boson mass provides a stringent test of the model. We measure the W boson mass, MW, using data corresponding to 8.8 inverse femtobarns of integrated luminosity collected in proton-antiproton collisions at a 1.96 TeV center-of-mass energy with the CDF II detector at the Fermilab Tevatron collider. A sample of approximately 4 million W boson candidates is used to obtain MW=80,433.5 ± 6.4 (stat) ± 6.9 (syst) = 80,433.5 ± 9.4 MeV/c2, the precision of which exceeds that of all previous measurements combined. This measurement is in significant tension with the standard model expectation.
Contact: Prof. F. Ukegawa
- 2024/07/06 Tanabata Lecture of Astronomy
Lectures by astronomers will be held near Tanabata Day. The state-of-the-art research content will be explained in an easy-to-understand manner to the general public. (in Japanese)
Click on the poster for details.
- Date： 6 July (Saturday) 13:30－16:30
- Venue: Tsukuba International Congress Center EPOCHAL, Conference room 101
- Program:
13:30- Koji Yoshikawa (Univ. Tsukuba) Supercomputer "Fugaku" × Large-scale structure of the universe × Neutrinos 15:00- Nario Kuno (Univ. Tsukuba) Let's take a radio telescope to Antarctica! -- In search of the best sky on earth 16:30 End - Target: General public (junior high school students and above)
- Participation fee: Free
Contact: Prof. N. Kuno (TEL: 029-853-5080)
- 2024/07/14 Assi. Prof. Hashimoto made a press release on Bound star clusters 460 Myr after the Big Bang
Assistant Professor Takuya Hashimoto (Division of the Antarctic Astronomy) held a press conference on ”Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang”, published in Nature, DOI: 10.1038/s41586-024-07703-7.
For more details, see the press release article and a web announcement of the Univ. of Tsukuba.
- Visit [Archive] for previous news and announcements.
