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
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Visit [About the Center] for an overview of the Center.
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Visit [Projects] for the research projects of the Center.
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Visit [Organization] for the organization and members of the Center.
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Visit [Materials] for introductory materials and reports.
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
- 2023/04/29-30 International Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities
--- beyond the Critical Point towards Neutron Stars --- (WHBM 2023)
- Date: 29-30 Apr 2023
- Venue: Rooms 1D201, 1D204, Building 1D, Univ.Tsukuba
- 【URL】 https://conference-indico.kek.jp/event/205/
- 【Contact】 whbm2023-loc _AT_ ml.cc.tsukuba.ac.jp
- Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities --- beyond the Critical Point towards Neutron Stars --- (WHBM 2023) will take place in Univ. of Tsukuba at Tsukuba, Ibaraki as a satellite conference of ATHIC2023, focused specially on High Density Physics topics covering Critical Point, QCD Phase Diagram, Flow, Correlations, Fluctuations, Chirality, Vorticity, Hadron interactions, Hypernuclei, Equation of State and Neutron Stars.
Contact: Prof. S. Esumi
- 2023/04/24-27 The 9th Asian Triangle Heavy-Ion Conference (ATHIC 2023)
- Date: 24-27 Apr 2023
- Venue: JMS Aster Plaza, 4-17 Kakomachi, Naka-ku, Hiroshima, Japan
- URL: https://indico.cern.ch/event/1176274/
- Contact: athic23-loc _AT_ ml.hiroshima-u.ac.jp
- The 9th Asian Triangle Heavy-Ion Conference (ATHIC 2023) will be held in Hiroshima for high energy heavy-ion physics to investigate and discuss Quark Gluon Plasma, especially on Initial state and thermal equilibrium, Jets and medium response, Heavy quarks and quarkonia, Electromagnetic probes, Collective dynamics, Correlations and fluctuations, QCD phase diagram and extreme states, QGP in small systems, Intense field and vorticity, Hadron interactions and exotics.
- 2022/11/28 TCHoU Research Member Meeting / Activity and Achievement Reports
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU.
- Date: 28 Nov 2022 (Mo)
- Venue: Natural Science Bldg. B114 at Univ. Tsukuba (+ zoom online meeting)
- Program: (presentations are given mostly in Japanese)
- Number of participants: 43 (incl. remote 24)
- Click on the title for the presentation slide.
Contact: Asso.Prof. K. Hara
- 2022/10/31 HoU seminar
- Date： Oct. 31, 2022 (mon) 17:00-18:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Assi.Prof. Hidetoshi Otono (Kyushu Univ.)
- Title: "Status of the FASER experiment"
- The FASER experiment is a new experiment that is being placed 480 meters downstream of the ATLAS experiment at the CERN LHC. FASER is designed to discover dark photons and other light and very weakly-interacting particles that are produced in the far-forward region, outside of the ATLAS detector acceptance. FASER would also directly detect collider neutrinos for the first time and study their cross sections at TeV energies, where no such measurements currently exist. The experiment has been successfully constructed and installed, already starting data acquisition since the beginning of LHC Run 3 in 2022. This talk will present the physics prospects, detector design, and early data analysis of FASER.
Contact: Prof. F. Ukegawa
- 2022/10/24-28 31st International Workshop Vertex2022
The International Workshop on Vertex Detectors (VERTEX) is a major annual series of international workshops for physicists and engineers from the high energy and nuclear physics community. VERTEX provides an international forum to exchange the experiences and needs of the community, and to review recent, ongoing, and future activities on silicon based vertex detectors. The workshop covers a wide range of topics: existing and future detectors, new developments, radiation hardness, simulation, tracking and vertexing, electronics and triggering, applications to medical and other fields
Vertex2022 is cohosted by TCHoU. Asso.Prof. K. Hara, Div. Photon and Particle Detectors, TCHoU, is a member of the IAC and is chairing the LOC of this Workshop.
- Date: Oct. 24-28, 2022
- Venue: on-site at Tateyama Resort Hotel, Tateyama, Japan
- URL: https://indico.cern.ch/event/vertex2022
Visit the workshop web site for details.
A report on the wworkshop is available here, and a report for HEPNews (in Japanese) is here.
Contact: Asso.Prof. K. Hara
- 2022/10/14 Sayuka Kita received the Student Presentation Award of the Physical Society of Japan
Sayuka Kita, master course student of the particle experiment group in TCHoU, received the Student Presentation Award of the Physical Society of Japa for "A study of the new LGAD detector (AC-LGAD) for the finer pitch electrode," presented in the autumn meeting of JPS 2022（award recipient list for 2022/autumn). This was her second award since 2021/autumn.
In accelerator experiments, precision measurements of the reaction point and emerging particle tracks are a key to determine what kind of interaction is involved. For precision measurement of the particle properties or discovery of new particles, more reactions are required and hence the particle density increases substantially. Development of the precision particle detector operational in such environments is a of prime issue for future high precision experiments. Conventionally this has been achieved by minimizing the detector electrode size. A group of experimental particle physics group in which Ms Kita is involved, led by Division leader K. Hara and collaborative member K. Nakamura (KEK) of the Photon and Particle Division, adopts LGAD - semiconductor diode with internal gain - which is superior in timing determination, to realise a 4D detector capable of precision determination of both position and time. For minimizing the electrode size of the LGAD, the group is investigating AC-coupled electrodes, and her presentation is on the development research of such device, AC-LGAD.
- 2022/09/27 Tsukuba Global Science Week (TGSW) 2022 "Universe Evolution and Matter Origin"
As the Session 5-9 of the Tsukuba Global Science Week 2021, TCHoU is organizing International Workshop on "Universe Evolution and Matter Origin" as an on-line workshop.
- Date: Sept.28, 2022 (Sat) 12:15-21:10
- Venue: Online Zoom meeting (will be accounced to the registered participants)
- URL: TGSW / Session 5-9
- Program: program
Early Afternoon Session (Chair: Fumihiko Ukegawa) 12:50-13:00 Nario Kuno Univ. Tsukuba Opening 13:00-13:30 Tai Oshima NAOJ Probing the distant universe with the wide field of view sub-millimeter camera 13:30-14:10 Yuji Takeuchi Univ. Tsukuba R&D of Hf-STJ as FIR single-photon spectrometer for COBAND 14:10-14:40 Kazuyuki Kanaya Osaka Univ. Critical point in heavy-quark QCD at finite temperature Late Afternoon Session (Chair: ShinIchi Esumi) 15:20-15:50 Yuma Sugahara Waseda Univ. / NAOJ Emission line modeling of galaxies at Cosmic Dawn 15:50-16:30 Yong-Hamb Kim Center for Underground Phys.,
Inst. Basic Sci.0νββ Searches with Low-Temperature Thermal Calorimeters 16:30-17:00 Sheng-Cai Shi Purple Mountain Observatory,
Chinese Academy of Sci.Development of THz Astronomy in China 17:00-17:40 Joachim Stroth Frankfurt Univ. / GSI Exploring the phase structure of QCD matter at high baryo-chemical potential with HADES and CBM Evening Session (Chair: Kazuhiko Hara) 18:10-18:50 Tatsuya Masubuchi Univ. Tokyo 10th Anniversary of the Higgs Boson Discovery ―What we learned in a decade― 18:50-19:20 Kate Pattle University College London The Cold Universe: Science Highlights from the SCUBA-2 Camera 19:20-20:00 Giuseppe Iacobucci Univ. Geneve, Next generation silicon pixel detectors: towards picosecond timing 20:00-20:40 Jiangyong Jia Stony Brook Univ. / BNL Imaging the nuclear structure and the initial condition of heavy ion collisions across nuclear chart 20:40-20:50 Fumihiko Ukegawa Univ. Tsukuba Closing - Number of participants: 68 (registered: 192名)
Please click on the title for the presentation slides (in Japanese).
Contact: Prof. Yuji Takeuchi
- 2022/8/1 HoU seminar
- Date： Aug. 1, 2022 (mon) 14:00- (about one hour）
- Venue: 1F201, 1st cluster, Univ. of Tsukuba + zoom online meeting
- Speaker: Prof. Nu Xu (LBNL)
- Title: "Recent Results from RHIC Beam Energy Scan and Future Perspectives of Physics at High Baryon Density"
- In this talk, I will present recent results from the successful beam energy scan program carried out at the RHIC. The focus will be given on the latest new data from 3 GeV Au+Au collisions. The implications on collectivity, the search for QCD critical point and hyper-nuclei production will be discussed. Finally I will address the opportunities for studying nuclear matter EOS at high baryon density with the CBM experiment at FAIR.
The on-sie lecture room may be changed depending on the number of on-site participants. In case you want to participate on site, please inform the convener no later than about one week before the seminar.
Contact: Prof. S. Esumi (esumi.shinichi.gn [at] u.tsukuba.ac.jp)
- 2022/7/9 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)
- Date： 9 July 13:30－16:3
- Venue: zoom online meeting
- Program:
13:30- Mariko Nomura (National Institute of Technology (KOSEN), Kure College) The mystery of a supermassive black hole approaching with numerical simulation 15:00- Shuro Takano (Nihon University) See the matter in space with a radio telescope! -Across astronomy, physics, and chemistry- 16:30 End - Target: General public (junior high school students and above)
- Participation fee: Free (Internet communication fee is your own expense)
- Participation application: Please apply from the following URL by the day before.
- https://forms.office.com/r/vp3AERnPb4
Please click on the title for the presentation slides (in Japanese).
Contact: Prof. N. Kuno (TEL: 029-853-5080, e-mail: kuno.nario.gt [at] u.tsukuba.ac.jp)
- 2022/06/24 TCHoU Research Member Meeting / Activity and Achievement Reports
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU. Reports on main achievements in each field in FY 2021 are presented.
- Date: 24 Jun 2022 (Fr)
- Venue: Natural Science Bldg. B114 at Univ. Tsukuba + zoom online meeting
- Program: (presentations are given mostly in Japanese)
- Number of participants: 38
- Click on the title for the presentation slide.
Contact: Asso.Prof. Y. Takeuchi
- 2022/5/28 Open lecture "History of the Universe"
We explained the history of the universe of 13.8 billion years for high school students. We also introduced the research being conducted at the Tomonaga Center, University of Tsukuba.
- Date: 28, 29 May 2022
- Venue: 7A105, Kasuga campus, University of Tsukuba
- Program:
28 May (Sat) 13:30-14:30 Prof. M. Umemura Big bang cosmology 14:45-15:45 Asso.Prof. K. Hara Elementary particle mass and Higgs boson 16:00-17:00 Asso.Prof. Y. Takeuchi Challenge to cosmic neutrinos 29 May (Sun) 13:30-14:30 Prof. S. Esumi QGP phase transition in the early universe 14:45-15:45 Prof. N. Kuno Birth and evolution of stars and galaxies - Number of participants: 26
Contact: Asso.Prof. Y. Takeychi
- 2022/5/27 HoU Seminar
We have an TCHoU-HET-HEP Joint seminar on the CDF experiment about the W boson mass, introduced in our News on 8 Apr 2022.
- Date: 27 May 2022 (Fri) 13:45-15:00
- Venue: zoom online meeting
- Talk 1:
- Fumihiko Ukegawa (Univ. of Tsukuba)
- "The history of the CDF experiment and its early physics results, and how we detect the W boson"
- The CDF experiment at the Fermilab proton-antiproton collider started under the US-Japan Accord, which was initiated by the Fukuda-Carter dialog in 1978. After its construction in early 1980s, CDF recorded the first collisions in 1985, experienced a pilot run in 87, a first physics run in 88-89, and a substantial physics run (Run-I) in 92-96. Through the period, CDF, as an energy-frontier particle physics experiment, produced many important physics results such as the discovery of the top quark. In this talk we review the history of the experiment and explain the method to detect and measure the production and decays of the W boson.
- Talk 2:
- Koji Sato (Univ. of Tsukuba)
- "High Precision W Boson Mass Measurement with the CDF Detector"
- Tevatron is a proton-antiproton collider located at Fermi National Accelerator Laboratory in the United States of America. The CDF Experiment collected 8.8 /fb of proton-antiproton collision data during the Run II of the Tevatron operation from 2002 through 2011. The CDF Collaboration analyzed the full Run II data and obtained the measured W boson mass of 80.433.5 +/- 9.4 MeV/c^2. In this talk, we review this new W mass measurement released on April, 2022, whose precision surpasses that of the previous world average. This measurement is in tension with the Standard Model expectation.
- Number of participants: 50
Please click on the title for the presentation slides (in Japanese).
Contact: Asso.Prof. Y. Takeuchi (takeuchi [at] hep.px.tsukuba.ac.jp), Assi.Prof. Y. Asano (asano [at] het.ph.tsukuba.ac.jp)
- 2022/04/08 CDF experiment made the most precise measurement of the mass of the W boson, a carrier of the weak force
The CDF Collaboration, in which many members of the Div. of Elementary Particles, TCHoU, are taking an important part, has now measured the mass of the W boson with the best precision ever by an experiment at the Fermi National laboratory (Fermilab) in the United States. The W boson, along with the Z boson, acts as the carrier of the weak force between elementary particles. By determining its mass very precisely, coupled with information on the masses of other particles such as the top quark and the Higgs boson, one can test the standard theory of elementary particles. The new measurement shows a significant difference from the prediction of the Standard Theory of particles, at a level of seven standard deviations [Science vol.376, issue 6589, pp.125, 2022/4/7]
Visit https://hep-www.px.tsukuba.ac.jp/news/W-mass-2022/ for details (in Japanese).
The finding of CDF, suggesting existence of fundamental lows beyond the Standard Theory, has been introduced by NHK News on 25th April and news papers such as Yomiuri News Paper on 8th April.
- 2022/04 Assi.Prof. Nonaka received “Yagi award 2022”
Assi.Prof. Toshihiro Nonaka, Div. of Quark Nuclear Matters, has received “Yagi award 2022”. Dr. Nonaka has been working on RHIC-STAR experiment to search for the QCD critical point through the measurements of fluctuations of conserved charges. He established procedures to correct the observables for various experimental artifacts, which has been widely used in this field and led to the observation of the hint on the critical point at the STAR experiment. Based on these contributions, he gave a plenary talk “Experimental Summary on Fluctuations of Conserved Charges” at the Quark Matter 2022 conference held in Krakow, Poland on April 4-10, 2022.
Yagi award is based on the donation to iTHEMS, Riken, Japan from bereaved family of late Professor Kohsuke Yagi of the Univ. of Tsukuba, who was a renowned Japanese nuclear physicist. Visit https://ithems.riken.jp/ja/about/yagi-award for details of the Yagi award.
- 2022/4/1 Member list and pamphlet of TCHoU were updated.
- 2022/3/24 TCHoU Workshoo for the Division of Quark Nuclear Matters
- Date: March 24 (Thu) 2022, 10:30-18:00
- Venue: zoom online meeting
- Program:
- Presentation Slides:
- S. Naimi
- M. Rosenbusch
- A. Pandey
- Y. Miake
- T. Chujo
- S. Esumi
- H. Sako
- K. Okubo
- M. Isshiki
- H. Park
- Number of participants: about 30
Contact: Assi.Prof. T. Nonaka
- 2022/3/23 TCHoU Workshoo for the Division of Elementary Particles
- Date: March 23 (Wed) 2022, 13:30-18:15
- Venue: zoom online meeting
- 【Program】
- Number of participants: 22
Visit https://hep-www.px.tsukuba.ac.jp/TCHoU/DEP/index.html#202203ws for presentation slides.
Contact: Assi.Prof. Y. Takeuchi
- 2022/3/22 TCHoU for the Division of Photon and Particle Detectors
- Date: Mar 22 (Tue) 2022, 10:00-12:00
- Venue: zoom online meeting
- 【Program】
- Number of participants: 20
Contact: Asso.Prof. K. Hara
- 2022/03/18 TCHoU Sterring Committee Meeting
- Date: 18 Mar 2020 (Fri) 14:00-16:30
- Venue: zoom online meeting
- Program: (presentations are in Japanese)
14:00-14:30 N. Kuno Activity report for TCHoU 14:30-14:45 N. Kuno Activity report for the Div. of Antarctic Astronomy 14:45-15:00 Y. Takeuchi Activity report for the Div. of Elementary Particles 15:00-15:15 S. Esumi Activity report for the Div. of Quark Nuclear Matters 15:15-15:30 K. Hara Activity report for the Div. of Photon and Particle Detectors 15:30-16:30 Discussions (closed)
The first part of the Sterring Committee Meeting is open to public. We also have TCHoU Workshops for each division to enhance collaborations with external institues towards clarification of the History of the Universe.
Mar 16-24, 2022 TCHoU Workshops (zoom online meetings) 16 Mar (We) 10:00-14:35 Div. of Antarctic Astronomy (closed) 22 Mar (Tu) 10:00-12:00 Div. of Photon and Particle Detectors [presentation materials 23 Mar (We) 3:30-18:15 Div. of Elementary Particles 24 Mar (Th) 10:30-18:00 Div. of Quark Nuclear Matters Contact: Prof. N. Kuno
- 2022/03/04 Assi. Prof. Hashimoto received the 2021 PASJ Excellent Paper Award
Assi. Prof.Takuya Hashimoto (Div. of Antarctic Astronomy, TCHoU) and his collaborators have received the 2021 PASJ Excellent Paper Award.
Title: "Big Three Dragons: Az=7.15 Lyman-break galaxy detected in [O III] 88 μm, [C II] 158 μm, and dust continuum with ALMA"
Using ALMA, the authors succeeded for the first time in simultaneously detecting emission lines of oxygen and carbon ions ([OIII] 88 μm and [CII] 158 μm) and thermal radiation from cosmic dust in a galaxy about 13 billion light years away. This has revealed the detailed nature of the galaxy in the early universe.
- 2022/03/02 HoU Seminar
- Date: 02 Mar 2022 (Wed) 15:30-
- Venue: zoom online meeting
- Speaker: Prof. Kazunori Itakura (Nagasaki Institute of Applied Sciences)
- Title: Physics of Relativistic Heavy-Ion Collisions via High-Energy Limit
- Number of participants: about 30
We have an intensive lecture for the graduate course in the Univ. of Tsukuba on "Relativistic Heavy-Ion Collisions via High-Energy Limit” by Prof. Kazunori Itakura from 28/Feb/2022 to 2/Mar/2022, 10:00-11:30, 13:00-14:30, and 15:00-16:30 (15:30- on 2 Mar.), as a fully online course. The last part of the lecture will be given as a seminar of the History of the Universe (HoU seminar) starting from 2/Mar/2022 15:30- in the same zoom room.
The lecture course on the various physics phenomena in relativistic heavy-ion collisions will be provided to guide a basic idea of such phenomena via theoretical point of view, especially from the high-energy limit. The gluon saturation known as Color Glass Condensate (CGC) and Glasma formation will be discussed in relation to the high-energy heavy-ion collisions.
Please click on the title for the presentation slides.
Contact: Prof. S. Esumi (esumi.shinichi.gn [at] u.tsukuba.ac.jp)
- 2022/02/25 HoU Seminar
- Date: 25 Feb. 2022 (Fri) 13:45-
- Venue: zoom online meeting
- Speaker: Asso. Prof. Hiroshi Matsuo (National Astronomical Observatory of Japan)
- Title: Far-infrared intensity interferometry for future space mission
- Number of participants: 24
We had an intensive lecture for the graduate course in the Univ. of Tsukuba on "Aspects of THz Astronomy -- from the technological developments --” by Prof. Hiroshi Matsuo, who is giving a seminar of the History of the Universe (HoU seminar) on 25. Feb. with the title given above.
Please click on the title for the presentation slides.
Contact: Prof. N. Kuno (kuno.nario.gt [at] u.tsukuba.ac.jp)
- Visit [Archive] for previous news and announcements.
