Seminar

A review of incompatibility in quantum information science (Topical Review Meeting #1)

May 26 (Mon) 16:00 - 17:30, 2025

Haruki Emori (Ph.D. Student, Graduate School of Information Science and Technology, Hokkaido University)

As the first activity of the Quantum Foundation Study Group, we will hold a Topical Review Meeting. In quantum mechanics and quantum information science, the exploration of “quantumness” is of fundamental importance. One key concept that captures quantumness is “incompatibility”. In this meeting, I will give a review on incompatibility. If time permits, I would also like to introduce some of my recent research on this topic and engage in discussions with the participants.

Venue: Seminar Room #359 (Main Venue) / via Zoom

Event Official Language: English

SISSI: Supernovae in a Shearing, Stratified Interstellar Medium

May 23 (Fri) 14:00 - 15:15, 2025

Leonard Romano (Ph.D. Student, Ludwig-Maximilians-Universität München, Germany)

Supernovae (SNe) are an important driver of the multiphase structure in the Interstellar Medium (ISM) and play an important role for regulating star formation. SNe inflate large bubbles of hot gas dubbed Supernova Remnants (SNRs) that can remain hot for several 10⁵-10⁶ years, contributing substantially to the volume filling hot phase, galactic outflows and the driving of turbulence in the ISM. In this talk, I am presenting the results of zoom-in simulations of SNRs embedded in a simulated isolated Milky-Way analogue, in order to investigate how environmental effects like shear, vertical stratification and a self-consistently generated ISM can affect various properties of SNRs. I find that initially microscopic SNRs, whose dynamics are dominated by local shock physics, after a few Myr enter a mesoscopic regime, where their dynamics are increasingly dominated by galactic scale processes. Based on these findings, I make predictions about SN-driven large-scale structure, such as galactic outflows and the geometry of large superbubbles in disk galaxies.

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

Beyond-classical simulations using a quantum annealer

May 23 (Fri) 10:00 - 11:15, 2025

Alberto Nocera (Senior Staff Scientist, Stewart Blusson Quantum Matter Institute, The University of British Columbia, Canada)

Join us for an electrifying online zoom talk featuring Dr. Alberto Nocera, the author of the groundbreaking Science article detailing D-Wave's quantum annealer outperforming classical supercomputers in simulating complex magnetic materials. D-Wave’s quantum annealer uses quantum annealing to efficiently solve optimization problems by finding low-energy states of complex systems. Unlike IBM and Quantinuum’s gate-based quantum computers, which are universal and execute algorithms via quantum circuits, D-Wave’s system is specialized but currently more scalable and practical for certain applications. While gate-based systems are still limited by noise and error rates, D-Wave’s annealer recently demonstrated a quantum advantage in simulating magnetic materials, outperforming classical supercomputers. This highlights a key difference: D-Wave excels in specific tasks today, while IBM and Quantinuum aim for broader, long-term quantum computational capabilities. Talk Abstract: Solving the equations governing the dynamics of interacting many-particle quantum systems is one of the biggest challenges in modern science. In 1982, Richard P. Feynman envisioned that the best way to emulate the behavior of many-particle quantum systems is to use another quantum system, starting the field of quantum simulation. Rather than seeking to solve the fundamental equations of quantum mechanics using conventional or classical computers, in quantum simulation one seeks to simulate a quantum system using an "analog device" mimicking its behavior, hoping to access solutions which are not easy to compute otherwise. In this talk, using the quantum annealing simulator device developed by D-Wave as a main tool, I will show that the use of tensor network methods has a key role in quantum simulation: besides benchmarking the quantum device, they can assess and help establishing its functionality beyond the classically simulatable regime [1].

Venue: via Zoom

Event Official Language: English

Moss sporophytes and their consumers: an overlooked interaction

May 22 (Thu) 13:00 - 14:00, 2025

Yume Imada (Assistant Professor, Division of Biological Sciences, Graduate School of Science, Kyoto University)

The evolution of plant-feeding in animals is deeply intertwined with the unintentional transport of diaspores. Zoochory (the dispersal of plant diaspores by animals) has been extensively studied in flowering plants, particularly with regard to seeds and fruits. Bryophytes, in contrast, have poorly been investigated, despite possessing traits favorable for animal-mediated dispersal: they are small, easily transported, and exhibit high totipotent capacity. It has long been believed that bryophytes are rarely consumed by animals. However, our field survey into sporophyte-feeding across diverse forest-dwelling mosses (the largest clade of bryophytes) revealed the ubiquity of spore consumption. This finding prompts a re-evaluation of the ecological function of the sporophyte in the alternation of generations in mosses. Moreover, our data suggest that this interaction may be framed within the mutualism–antagonism continuum. Finally, I aim to clarify key questions surrounding the reproduction and dispersal of spore-producing plants, particularly bryophytes.

Venue: via Zoom (Main Venue) / Seminar Room #359

Event Official Language: English

Universality class for driven interfaces and... integrable spin hydrodynamics?

May 19 (Mon) 15:00 - 17:00, 2025

Kazumasa A. Takeuchi (Associate Professor, Graduate School of Science, The University of Tokyo)

The Kardar-Parisi-Zhang (KPZ) universality class, originally formulated to describe driven systems such as growing interfaces, has undergone several paradigm shifts [1]. One major breakthrough was the discovery of exact solutions for one-dimensional models within the KPZ class — remarkable given their non-equilibrium and non-linear nature — enabled by underlying integrability. These exact results revealed nontrivial fluctuation properties, some closely linked to random matrix theory, which were subsequently observed in real experiments on driven interfaces. But more recently, the KPZ framework appears to be entering a new phase, extending unexpectedly to integrable spin chains at thermal equilibrium [2,3]. Although this connection was nearly dismissed when clear discrepancy in full counting statistics was reported, the speaker and collaborators numerically found that various two-point quantities agree precisely with KPZ exact solutions, so the KPZ class indeed governs integrable spin chains, yet only their two-point quantities [4]. I will also discuss a recent hydrodynamic theory aiming to bridge spin chains and KPZ, which, currently, falls short of fully explaining the numerical observations and calls for further refinement [2,3].

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

Stable homotopy theory of invertible quantum spin systems

May 16 (Fri) 16:00 - 18:00, 2025

Yosuke Kubota (Associate Professor, Graduate School of Science, Kyoto University)

In the past decade, A. Kitaev proposed that the set of invertible gapped quantum spin systems would form an \Omega-spectrum. This conjecture is considered to have potentially significant application to the study of SPT phases. Recently, we give a mathematically rigorous realization of this proposal with the language of functional analysis and operator algebra. This gives a unified proof of a series of existing researches. The proof also suggests to understand Kitaev's proposal from the viewpoint of coarse geometry of metric spaces. This association leads us to the concept of localization flow.

Venue: Seminar Room #359 (Main Venue) / via Zoom

Event Official Language: English

Topology and Brain Science

May 16 (Fri) 14:00 - 15:30, 2025

Shiu Gary (Professor, Department of Physics, University of Wisconsin-Madison, USA)

Venue: via Zoom

Event Official Language: English

The index of lattice Dirac operators and K-theory

May 15 (Thu) 13:30 - 15:00, 2025

Hidenori Fukaya (Assistant Professor, Department of Physics, The University of Osaka)

We show that the Wilson Dirac operator in lattice gauge theory can be identified as a mathematical object in K-theory and that its associated spectral flow is equal to the index. In comparison to the standard lattice Dirac operator index, our formulation does not require the Ginsparg-Wilson relation and has broader applicability to systems with boundaries and to the mod-two version of the indices in general dimensions. We numerically verify that the K and KO group formulas reproduce the known index theorems in continuum theory. We examine the Atiyah-Singer index on a flat two-dimensional torus and, for the first time, demonstrate that the Atiyah-Patodi-Singer index with nontrivial curved boundaries, as well as the mod-two versions, can be computed on a lattice (This seminar is co-organized with FQSP).

Venue: Seminar Room #359 (Main Venue) / via Zoom

Event Official Language: English

iTHEMS Biology welcomes 2 new members!

May 15 (Thu) 13:00 - 14:15, 2025

Isaac Planas Sitja (Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Antoine Diez (Research Scientist, Mathematical Application Research Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))

This meeting will be used to welcome 2 new members to the iTHEMS Biology Study Group; Postdoc Isaac Planas-Sitjà and Senior Researcher Antoine Diez. They will each give us a 15-20 min talk to introduce their research. If time permits, let's also use this time to catch up on each other's current research. I hope that many people will join us to welcome these new members and come meet them and hear about their research.

Venue: Hybrid format (4th floor public space & Zoom), Main Research Building

Event Official Language: English

2d Cardy-Rabinovici model with the modified Villain lattice formulation

May 9 (Fri) 14:00 - 15:00, 2025

Nagare Katayama (Ph.D. Student, Yukawa Institute for Theoretical Physics, Kyoto University)

One of the most famous scenarios of the quark confinement problem is the dual superconductor picture. In this picture, the quark confinement is induced by monopole condensation, but in the theory with a θ term, we expect that not only monopole but also dyon condensation is induced, as suggested by Cardy and Rabinovici through their intuitive arguments. In this study, the Witten effect of the theory of two-dimensional compact bosons with the θ term is examined using a modified Villain-type lattice theory that can treat the θ term and dion in a rigorous manner. In addition, we construct the 2d Cardy-Rabinovici model and analyze the phase diagram through the scaling dimension argument and the anomaly matching constraint.

Venue: Hybrid Format (3F #359 and Zoom), Main Research Building

Event Official Language: English

The role of the visual information of fish schooling via selective decision-making

May 8 (Thu) 16:00 - 17:00, 2025

Susumu Ito (Ph.D. Student, Department of Physics, Graduate School of Science, Tohoku University)

Visual cues play crucial roles in the collective motion of animals, birds, fish, and insects. Recently, experiments have revealed that organisms such as fish selectively utilize a portion, rather than the entirety, of visual information. This method of the visual interaction avoids heavy load for small brain of the organisms. However, the previous models using visual interaction implicitly assume that an agent interacts with all visible neighbors. Therefore, we study the effect of the selective decision-making on the collective motion via the agent-based model and the coarse grained continuous model. In the former study, we have constructed a visual model which takes into account the motion of visual attention of agents induced by the visual stimuli, and our model can simultaneously show the spontaneous appearance of various collective patterns and the bifurcation process of the tracking of a neighbor. The later study, the agents corresponds to the density field by the coarse graining, and the visual occlusion is treated in a self-consistent manner via a coarse-grained density field, which renders the interaction effectively pairwise. The model exhibits a discontinuous transition as in the conventional models by the local collision, and but the discontinuity is weakened by the non-locality of visual interaction. Our studies clarify the comprehensive coincidence with experimental results via selective decision-making and the essential role of non-locality in the visual interactions.

Venue: via Zoom

Event Official Language: English

Supernova axion emissivity with Δ(1232) resonance in heavy baryon chiral perturbation theory

May 1 (Thu) 16:00 - 17:30, 2025

Shu-Yu Ho (Postdoctoral Researcher, Institute of Physics, Academia Sinica, Taiwan)

Abstract: In this talk, we evaluate the energy loss rate of supernovae induced by the axion emission process π− + p → n + a with the Δ(1232) resonance in the heavy baryon chiral perturbation theory for the first time. Given the axion-nucleon-∆ interactions, we include the previously ignored Δ-mediated graphs to the π− + p → n + a process. In particular, the Δ_0-mediated diagram can give a resonance contribution to the supernova axion emission rate when the center-of-mass energy of the pion and proton approaches the Δ(1232) mass. With these new contributions, we find that for the typical supernova temperatures, compared with the earlier work with the axion-nucleon (and axion-pion-nucleon contact) interactions, the supernova axion emissivity can be enhanced by a factor of ∼ 4(2) in the Kim-Shifman-Vainshtein-Zakharov model and up to a factor of ∼ 5(2) in the Dine-Fischler-Srednicki-Zhitnitsky model with small tanβ values. Remarkably, we notice that the Δ(1232) resonance gives a destructive contribution to the supernova axion emission rate at high supernova temperatures, which is a nontrivial result in this study.

Venue: #345-347, 3F, Main Research Building (Main Venue) / via Zoom

Event Official Language: English

ComSHeL Launch Meeting

May 1 (Thu) 14:00 - 15:00, 2025

This is the very first meeting of the new Computationally-drive Solutions for Healthier Lives (ComSHeL) Study Group. The study group brings together members from iTHEMS' Fundamental Division together with the ECL Mathematical Genomics Unit and Teams from iTHEMS Applied Math Division (Medical Science Data-driven Math Team and Medical Science Deep Learning Team). The goal of this first meeting will be to discuss and decide on the format for this monthly study group, and to get to know each other (each member introducing their research briefly). I hope you can take the time to join us.

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

Insights on Issues in the Cold Dark Matter Hypothesis

April 25 (Fri) 14:00 - 15:15, 2025

Yuka Kaneda (Ph.D. Student, University of Tsukuba)

Dark matter accounts for 85% of the matter component of our universe, but its true nature is still unclear. The Lambda-Cold Dark Matter (CDM) model, which thought to be the standard model, reproduces well the statistical properties of the large-scale structure of our universe. However, at the scale of galaxies and dwarf galaxies, serious discrepancies between the predictions of the CDM model and observations have been pointed out. In this study, we tackle on the “cusp-core problem” and the “missing satellite problem,” which are typical examples of such discrepancies, using N-body simulations. In the talk, the physical trigger of cusp-to-core transition and the novel method to find missed satellites are presented.

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

Asymptotic Waves in Stars

April 23 (Wed) 14:00 - 15:30, 2025

Jim Fuller (Professor, Division of Physics, Mathematics, and Astronomy (TAPIR), California Institute of Technology (Caltech), USA)

Waves propagating through stars often have very short wavelengths in the radial direction, enabling WKB approximations that facilitate understanding. The main types of waves that propagate in stars are acoustic waves (restored by pressure forces) and gravity waves (restored by buoyancy forces). I will also discuss how the properties of these waves are changed by rotation (adding Coriolis and centrifugal forces) and magnetic fields (adding Lorentz forces). Finally, I will discuss how these waves carry energy and angular momentum through stars, and discuss some potential consequences for stellar evolution.

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

On IR/UV divergence of inflationary decoherence

April 22 (Tue) 14:00 - 15:30, 2025

Fumiya Sano (Ph.D. Student, Institute of Science Tokyo)

Supported by observational evidence indicating that cosmological scalar perturbations were nearly Gaussian at the beginning of the universe, it is anticipated that the origin of these perturbations is quantum fluctuations. Consequently, cosmic inflation provides a valuable laboratory for testing the quantum nature with/of gravity. Evaluation of the quantumness of the primordial perturbations is an inevitable step for the purpose. However, quantum states of the perturbations are suffered from IR/UV divergence, resulting in fully classical states. In this presentation, I will first review the evaluation of the quantum coherence in de Sitter spacetime as a measure of quantumness, and then show how to regularize the divergence.

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English

Artificial Intelligence and Neuroscience

April 11 (Fri) 14:00 - 15:30, 2025

Junichi Chikazoe (Professor, Center for Brain,Mind and KANSEI Sciences Research, Hiroshima University)

Recent advancements in artificial intelligence have led to various discoveries in the field of neuroscience. For example, it has been demonstrated that the information on orientation columns in the visual cortex and the basic taste information in the gustatory cortex can be extracted by applying machine learning to relatively low-resolution functional MRI data. Additionally, intriguing findings have emerged, such as the information processing structures of artificial neural circuits—designed independently of the brain—showing similarities to those of biological neural networks. In this talk, I will discuss the applications of artificial intelligence in neuroscience and explore future directions in this field.

Venue: Seminar Room #359 (Main Venue) / via Zoom

Event Official Language: English

iTHEMS Biology Study Group April Launch Meeting (Part 2)

April 10 (Thu) 13:00 - 14:00, 2025

Let's launch our Biology Study Group activities for the new year (Part 2 of 2). This meeting will be used to (1) say welcome to new member (SPDR Kenji Okubo, and Postdoc Lucas Sort); (2) discuss Biology seminar management in light of the new iTHEMS Centre; and (3) catch up on each other's current research. Since this will probably take us 2h, this will be Part 2 of 2 (Part 1 was on 4/3). On 4/10 (Part 2) we will get a 15 min introduction talk by Postdoc Lucas Sort. This meeting is open to all RIKEN and guests. You do not need to be a member of the iTHEMS Biology Study Group.

Venue: via Zoom / Hybrid Format (3F #359 and Zoom), Main Research Building

Event Official Language: English

A Strategy for Proving the Strong Eigenstate Thermalization Hypothesis: Chaotic Systems and Holography

April 3 (Thu) 16:00 - 17:00, 2025

Taishi Kawamoto (Ph.D. Student / JSPS Research Fellow DC, Yukawa Institute for Theoretical Physics, Kyoto University)

The strong eigenstate thermalization hypothesis (ETH) provides a sufficient condition for thermalization and equilibration. Although it is expected to hold in a wide class of highly chaotic theories, there are only a few analytic examples demonstrating the strong ETH in special cases, often through methods related to integrability. In this talk, I will explore sufficient conditions for the strong ETH that may apply to a broad range of chaotic theories. These conditions are expressed as inequalities involving the long-time averages of real-time thermal correlators. Specifically, I will discuss bottom-up holographic models that satisfy these conditions under certain assumptions, which are expected to hold in such models. This talk is based on the preprint 2411.09746 [hep-th].

Venue: Hybrid Format (3F #359 and Zoom), Seminar Room #359

Event Official Language: English