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:
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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)
Contact: Prof. S. Esumi
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU.
Contact: Asso.Prof. K. Hara
Contact: Prof. F. Ukegawa
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.
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
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.
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.
Early Afternoon Session (Chair: Fumihiko Ukegawa) | ||||
12:50-13:00 | Nario Kuno | Univ. Tsukuba | Opening | |
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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 |
Please click on the title for the presentation slides (in Japanese).
Contact: Prof. Yuji Takeuchi
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)
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)
13:30- | Mariko Nomura | (National Institute of Technology (KOSEN), Kure College) | The mystery of a supermassive black hole approaching with numerical simulation | |
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15:00- | Shuro Takano | (Nihon University) | See the matter in space with a radio telescope! -Across astronomy, physics, and chemistry- | |
16:30 | End |
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)
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.
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 |
Contact: Asso.Prof. Y. Takeychi
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.
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)
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.
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.
Contact: Assi.Prof. T. Nonaka
Visit https://hep-www.px.tsukuba.ac.jp/TCHoU/DEP/index.html#202203ws for presentation slides.
Contact: Assi.Prof. Y. Takeuchi
Contact: Asso.Prof. K. Hara
14:00-14:30 | N. Kuno | Activity report for TCHoU | ||
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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
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.
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)
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)