179 events in 2024
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Seminar
Probing structure of neutron stars through X-ray bursters
January 12 (Fri) at 14:00 - 15:15, 2024
Akira Dohi (Special Postdoctoral Researcher, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))
Type-I X-ray bursts are rapidly brightening phenomena triggered by the nuclear burning of light elements near the surface of accreting neutron stars. Most of the X-ray bursters show irregular behavior of light curves. However, some X-ray bursters are somehow quite regular, i.e., constant recurrence time and constant shaper of light curves, and are often called Clocked bursters, which are powerful sites to probe uncertainties of many model parameters such as accretion rate, the composition of accreted matter, reaction rates, neutron star structure, and temperature. In this study, we focus on the uncertainties of the equation of states, which determines the latter two properties. Based on our numerical models covering whole areas of neutron stars, we will present their impact on X-ray burst light curves. Furthermore, we will discuss the possibility of constraining the equation of states from Clocked bursters such as GS 1826-24 and 1RXS J180408.9-342058.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English
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Others
Seoul National University student group visit
January 10 (Wed) at 14:00 - 20:00, 2024
Catherine Beauchemin (Deputy Program Director, iTHEMS)
Akinori Tanaka (Senior Research Scientist, RIKEN Center for Advanced Intelligence Project (AIP))
Misako Tatsuuma (Research Scientist, iTHEMS)
Ryo Namba (Senior Research Scientist, iTHEMS)
Dongwook Ghim (Postdoctoral Researcher, iTHEMS)
Steffen Backes (Senior Research Scientist, iTHEMS)A group of 22 undergraduate students in the GLEAP programme at Seoul National University will visit iTHEMS to hear short talks by our members, exchange one-on-one, and visit our facilities. I would like to encourage all available iTHEMS members to take part in this event which will be held in different spaces throughout the day, all at the RIKEN Wako campus Main Research Building: 15:50-16:10 at iTHEMS Common Room (#246-248) Coffee break with iTHEMS members and SNU visitors 16:10-17:50 on 4th floor, room #435-437 Short talks by iTHEMS members 18:05-18:30 in 3rd floor common space Short intro talks by SNU visitors 18:30-20:00 in 3rd floor common space Free informal discussion between SNU visitors and iTHEMS members over some light food [Note some slight changes in the times previously announced]
Venue: 3rd floor public space, Main Research Building / #435-437, Main Research Building / Common Room #246-248
Event Official Language: English
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Seminar
Symmetry Topological field theory for Subsystem symmetry
January 9 (Tue) at 15:00 - 16:00, 2024
Qiang Jia (Research Fellow, School of Physics, Korea Institute for Advanced Study (KIAS), Republic of Korea)
We generalize the idea of symmetry topological field theory (SymTFT) to subsystem symmetry. We propose the 2-foliated BF theory with level N in (3+1)d as subsystem SymTFT for subsystem Z_N symmetry in (2+1)d. Focusing on N=2, we investigate various topological boundaries. The subsystem Kramers-Wannier and Jordan-Wigner dualities can be viewed as boundary transformations of the subsystem SymTFT and are included in a larger duality web from the subsystem SL(2,Z_2) symmetry of the bulk foliated BF theory.
Venue: via Zoom / Seminar Room #359
Event Official Language: English
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Workshop
Functional Renormalization Group at Niigata 2024
January 7 (Sun) - 8 (Mon), 2024
Gergely Fejos (Assistant Professor, Institute of Physics, Eötvös Loránd University, Hungary)
Kenji Fukushima (Professor, Department of Physics, Graduate School of Science, The University of Tokyo)
Kouichi Okunishi (Associate Professor, Faculty of Science, Niigata University)
Junichi Haruna (Ph.D. Student, Graduate School of Science, Kyoto University)
Xu-Guang Huang (Professor, Physics Department and Center for Particle Physics and Field Theory, Fudan University, China)
Katsumi Itoh (Professor, Faculty of Education, Niigata University)
Kiyoharu Kawana (Research Fellow, Korea Institute for Advanced Study (KIAS), Republic of Korea)
Shunsuke Yabunaka (Researcher, Japan Atomic Energy Agency (JAEA))
Takeru Yokota (Special Postdoctoral Researcher, iTHEMS)One of the most fundamental challenges in theoretical physics is to uncover the physical properties of strongly-interacting quantum many-body systems. This problem is shared in both subatomic physics and condensed matter physics; e.g., to unveil ground state structures and dynamical aspects of quantum systems. However, it has been an unresolved issue to establish non-perturbative theoretical tools, which allows a reliable analytic approach to quantum many-body problems described by field theory. The Functional Renormalization Group (FRG) is proposed as one of the theoretical methods that facilitates the non-perturbative investigation of quantum many-body systems. The FRG has found applications in various fields of physics, ranging from particle and nuclear physics to condensed matter physics, leading to several unique achievements in each fields. The aim of this two-day workshop is to provide an overview of the recent applications and progress of FRG in various fields of physics, discuss future directions, and explore potential new collaborations that bridge different fields of physics.
Venue: Kaishi Professional University Yoneyama Campus (Main Venue) / via Zoom
Event Official Language: English
179 events in 2024