This the semi-regular opportunity for iTHEMS Biology members to discuss their current research progress and/or difficulties and/or research questions. Anyone is welcome to join. It will be held in hybrid form.

iTHEMS Cosmology Forum Workshop is a series of short workshops, each focused on an emerging topics in cosmology. The targeted audience is cosmologists, high-energy physicists and astronomers interested in learning about the subject, not just those who have already worked on the topic. The goal of the workshop is to provide working knowledge of the topic and leave dedicated time for discussions to encourage mutual interactions among participants.

The second workshop is devoted to explanations of the stochastic gravitational wave background (SGWB). The SGWB is a significant detection of GW from pulsar timing arrays. The origin of this background could be either supermassive black holes or primordial. Surprisingly, both of these early Universe mechanisms are not well understood. This one-day workshop gathers both the observational and theoretical aspects of this growing topic.

The workshop will be in English. The workshop venue will be either at Main Research Building #435-437 or at Okochi Hall, and we will decide and announce which one will be actually used after the registration is closed.

The workshops are organised by the iTHEMS Cosmology Forum working group, which is the successor of the Dark Matter Working Group at RIKEN iTHEMS.

Invited Speakers:
Keitaro Takahashi (Kumamoto University)
TBA

Kazuyuki Sugimura (Hokkaido University)
Supermassive black hole formation

Ryusuke Jinno (Kobe University)
First-order phase transitions and gravitational wave production in the early Univers

Yuichiro Tada (Nagoya University)
Scalar-induced gravitational waves as a cosmological phonograph

Time table:
09:00-09:30 -- Opening remarks and coffee
09:30-10:45 -- Takahashi (keynote)
10:45-11:45 -- Sugimura
11:45-13:30 -- Lunch time
13:30-14:30 -- Jinno
14:30-15:30 -- Discussion and coffee
15:30-16:30 -- Tada
16:30-17:30 -- Panel Discussion

Organisers:
Kohei Hayashi, Nagisa Hiroshima, Derek Inman, Amaury Micheli, Ryo Namba

We will have the 5th workshop on "Medicine and Math" in Kobe (hybrid style) on Sep. 29-30, 2024.
For more information and registration, please visit the related links.

Organizers:
Akihisa Yamamoto (RIKEN iTHEMS)
Tetsuo Hatsuda (RIKEN iTHEMS)
Motomu Tanaka (Heidelberg Univ. / Kyoto Univ.)
Hiroshi Suito (Tohoku Univ. / RIKEN iTHEMS)
Eiryo Kawakami (Chiba Univ. / RIKEN R-IH)
Takashi Sakajo (Kyoto Univ. / RIKEN iTHEMS)

Ever wondered what data is considered sufficient for approval of a new drug or vaccine? In this talk, I will talk about some of the errors and shortcomings with how clinical trials are run and regulated. I will also show how the data and analyses behind clinical trials can be very poorly done. I will show one example of very bad data and analysis, but I will also show an example of the valuable information that can come out of doing a good job in presenting, interpreting, and following the data. I will highlight how the over-reliance on summarizing measures like averages and the Gaussian assumption can lead to overlooking therapies that could otherwise have been extremely effective.

This talk should be of critical importance to those working in the fields of health, medical and clinical research. But this talk is about data and its analysis, and as such is also very relevant to physicists and other scientists who generate, present or analyse data as part of their research.

Based on our paper [1], this presentation will show the application of complex scaling method(CSM) to scattering calculations of atomic systems. While CSM has been extensively used to study resonance states, the application of CSM to scattering calculations was proposed recently with applications in nuclear physics. In our study, we apply the CSM scattering calculation to atomic systems and propose an effective correction to avoid the problem of slow convergence to the number of complex eigen energies. Our results with the effective correction agree well with those reported in the literature for positron scattering with the targets Ne, Ar, Kr, Xe, H, He, He+, and Li2+.
In this presentation, we introduce the framework of phase-shift calculation using the CSM together with the examples of the positron scattering, and advantages and features of this approach.

[This seminar is co-hosted by Few-body Systems in Physics Laboratory, RIKEN Nishina Center.]

Recently, there has been a growing trend to consider cognitive, and social phenomena as Open Quantum Systems, and to mathematically define the fundamental principles behind them through so-called “Quantum-Like Modeling”. It has been extremely difficult to systematically explain complexities of such phenomena within humans’ cognitive traits based on classical “rational” reasoning. Quantum-Like Modeling suggests that using quantum probability calculus and its applications could be useful to rationalize such phenomena and expand previous understandings, obtained through simple linear algebra, by applying quantum formalizations. Just as physicists explored a new branch of mathematics, the theory of operators in complex Hilbert space, to describe the quantum phenomena in an effective way, considerations here will be built on the methodology and mathematical apparatus of quantum theory and directed to applications outside of physics, namely to, cognition, psychology, decision-making, economics, finances, as well as the social and political sciences.

Programme
14:00~14:10 Atsushi Iriki: Introduction. Potential of quantum computing for humanities
14:10~15:10 Andrei Khrennikov: Tutorial. Ubiquitous Quantum: from genetics and biological evolution to cognition, psychology, decision making, and social science
15:10~15:40 Masanao Ozawa: Quantum Instrument -- Measurement to cognition with QC-simulation
Break
16:00~16:30 Haruki Emori: Applications of quantum computers to cognitive sciences based on Quantum Instrument
16:30~17:00 Miho Fuyama: Subjective Experiences and Superposition State in Narrative Reading
17:00~17:30 General Discussion
18:00~19:00 Networking Mixer (RIKEN canteen #1)

Registration Deadline
September 26 (Thur), 2024 (for those attending both the workshop and networking mixer (banquet, free of charge))
October 4 (Fri), 2024 (for those attending only the workshop)

The density functional theory (DFT) is one of the powerful methods to solve quantum many-body problems, which, in principle, gives the exact energy and density of the ground state. The accuracy of DFT is, in practice, determined by the accuracy of an energy density functional (EDF) since the exact EDF is still unknown. Currently, DFT has been used in many communities, including nuclear physics, quantum chemistry, and condensed matter physics, while the fundamental study of DFT, such as the first principle derivations of an accurate EDF and methods to calculate many observables from obtained densities and excited states, is still ongoing. However, there has been little opportunity to have interdisciplinary communication.

On December 2022, we had the first workshop on this series (DFT2022) at Yukawa Institute for Theoretical Physics, Kyoto University, and several interdisciplinary discussions and collaborations were started. On February 2024, we had the second workshop on this series (DFT2024) at RIKEN Kobe Campus, and more stimulated discussion occured. To keep and extend collaborations, we organize the third workshop. Since the third workshop, we extend the scope of the workshop to the development and application of DFT as well. In this workshop, the current status and issues of each discipline will be shared towards solving these problems by meeting together among researchers in mathematics, nuclear physics, quantum chemistry, and condensed matter physics.

This workshop mainly comprises lectures/seminars on cutting-edge topics and discussion, while sessions composed of contributed talks are also planned.