# Seminar

## Classical liquids and functional renormalization group

December 17 at 13:00 - 14:30, 2020

Dr. Takeru Yokota (Postdoctoral Researcher, Institute for Solid State Physics, The University of Tokyo)

Development of methods for classical statistical mechanics is desired for accurate predictions of the structures and thermodynamic properties of liquids. A powerful framework to describe classical liq...more

Venue: via Zoom

Event Official Language: English

## Scattering theory for half-line Schrödinger operators: analytic and topological results

December 7 at 16:00 - 18:10, 2020

Dr. Hideki Inoue (Nagoya University)

Levinson’s theorem is a surprising result in quantum scattering theory, which relates the number of bound states and the scattering part of the underlying quantum system. For the last about ten years,...more

Event Official Language: English

Today

## KPZ equation, attractive bosons, and the Efimov effect

December 3 at 13:00 - 14:30, 2020

Dr. Yusuke Nishida (Associate Professor, Department of Physics, Tokyo Institute of Technology)

The Kardar-Parisi-Zhang (KPZ) equation for surface growth has been a paradigmatic model in nonequilibrium statistical physics. In particular, it in dimensions higher than two undergoes a roughening tr...more

Venue: via Zoom

Event Official Language: English

Today

## Directional dark matter search and the technologies

December 3 at 10:00 - 11:00, 2020

Dr. Tatsuhiro Naka (Lecturer, Department of Physics, Toho University / Specially Appointed Assistant Professor, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University)

*Detailed information about the seminar refer to the email.

Venue: via Zoom

Event Official Language: English

## Journal club of Information Theory SG

December 1 at 13:00 - 14:00, 2020

Dr. Akinori Tanaka (Senior Research Scientist, iTHEMS)

The practical updating process of deep neural networks based on stochastic gradient descent is quite similar to stochastic dynamics described by Langevin equation. Under the Langevin system, we can "d...more

Venue: via Zoom

Event Official Language: English

## Flat and spherical surface approximations

November 30 at 16:00 - 17:30, 2020

Dr. Martin Skrodzki (Visiting Researcher, iTHEMS)

State-of-the-art acquisition devices produce surface representations of increasingly high resolution. While these detailed representations are important for production, they are problematic e.g. when ...more

Venue: via Zoom

Event Official Language: English

## Rotifer can be a good model organism for theoretical biology

November 27 at 10:00 - 11:00, 2020

Dr. Yuri Konami (Specially Appointed Assistant Professor, Graduate School of Agricultural and Life Sciences, The University of Tokyo)

Rotifers are cylindrical zooplankton which constitute the phylum Rotifera. They have organs and tissues including ganglia, muscles, digestive organs, ovaries, and sensory organs in their <1mm body. Ro...more

Venue: via Zoom

Event Official Language: English

## Symmetry and conservation laws in neural networks

November 20 at 10:00 - 11:00, 2020

Dr. Hidenori Tanaka (Group Leader & Senior Scientist, Physics & Informatics Laboratories, NTT Research, Inc., USA / Visiting Scholar, Stanford University, USA)

Symmetry is the central guiding principle in the exploration of the physical world but has been underutilized in understanding and engineering neural networks. We first identify simple yet powerful ge...more

Venue: via Zoom

Event Official Language: English

## Representations of fundamental groups and 3-manifold topology

November 16 at 16:00 - 18:10, 2020

Dr. Takahiro Kitayama (Associate Professor, Graduate School of Mathematical Sciences, The university of Tokyo)

In 3-dimensional topology the great progress during the last two decades revealed that various properties of 3-manifolds are well understood from their fundamental groups. I will give an introduction ...more

Venue: via Zoom

Event Official Language: English

## Efficient probabilistic assessment of building performance: sequential Monte Carlo and decomposition methods

November 13 at 16:00 - 18:10, 2020

Dr. Tianfeng Hou (Postdoctoral Researcher, iTHEMS)

The use of numerical simulations for complex systems is common. However, significant uncertainties may exist for many of the involved variables, and in order to ensure the reliability of our simulatio...more

Venue: via Zoom

Event Official Language: English

## Some idea on quantum tunneling via Lefschetz thimbles

November 12 at 10:30 - 12:00, 2020

Dr. Yuya Tanizaki (Assistant Professor, Yukawa Institute for Theoretical Physics, Kyoto University)

In this talk, I will explain my previous study with Takayuki Koike on a possible approach to quantum tunneling via Lefschetz thimbles. We classified all the complex saddle points for the real-time pat...more

Venue: via Zoom

Event Official Language: English

## Mathematics of thermalization in isolated quantum systems

November 10 at 16:00 - 18:10, 2020

Dr. Naoto Shiraishi (assistant professor, Faculty of Science Department of Physics, Gakushuin University)

If an isolated macroscopic quantum system is left at a nonequilibrium state, then this system will relax to the unique equilibrium state, which is called thermalization. Most of quantum many-body syst...more

Venue: via Zoom

Event Official Language: English

## Mathematical aspects of quasi-Monte Carlo integration

November 5 at 16:00 - 18:10, 2020

Dr. Kosuke Suzuki (Assistant Professor, Graduate School of Advanced Science and Engineering, Hiroshima University)

In this talk, I will introduce mathematical aspects of quasi-Monte Carlo (QMC) integration. We aim to approximate the integral of a function on the d-dimensional hypercube [0,1]^d. A useful approach i...more

Venue: via Zoom

Event Official Language: English

## Evolution of a peak of genetic divergence driven by local adaptation

November 5 at 10:00 - 11:00, 2020

Dr. Takahiro Sakamoto (Postdoctoral Researcher, The Graduate University for Advanced Studies, SOKENDAI)

In species that are distributed in various environments, each subpopulation adapts to the local environment. In general, when there is migration between subpopulations, genetic divergence does not pro...more

Venue: via Zoom

Event Official Language: English

## Basics of population genomic data analysis

October 29 at 10:00 - 11:00, 2020

Dr. Jeffrey Fawcett (Senior Research Scientist, iTHEMS)

In recent years, it has become possible to obtain the DNA sequence data of a large number of individuals of the same species. This data set is basically a M (number of samples) x N (number of genomic ...more

Venue: via Zoom

Event Official Language: English

## Toward simulating Superstring/M-theory on a Quantum Computer

October 23 at 17:00 - 18:00, 2020

Dr. Masanori Hanada (Department of Mathematics, University of Surrey, UK)

We present a framework for simulating superstring/M-theory on a quantum computer, based on holographic duality. Because holographicduality maps superstring/M-theory to quantum field theories (QFTs), w...more

Venue: via Zoom

Event Official Language: English

## Realistic shell model and chiral three-body force

October 22 at 13:30 - 15:00, 2020

Dr. Tokuro Fukui (Researcher, Yukawa Institute for Theoretical Physics, Kyoto University)

We show an evolution to derive the effective Hamiltonian in the shell-model framework starting from two- and three-body interactions based on the chiral effective field theory. A new way to calculate ...more

Venue: via Zoom

Event Official Language: English

## Bayesian nonparametric estimation of Random Dynamical Systems

October 21 at 14:00 - 15:00, 2020

Dr. Christos Merkatas (Postdoctoral Researcher, Aalto University, Finland)

In this talk, a Bayesian nonparametric framework for the estimation and prediction, from observed time series data, of discretized random dynamical systems is presented [1]. The size of the observed t...more

Venue: via Zoom

Event Official Language: English

## Composite Dark matter and gravitational waves

October 20 at 10:00 - 11:00, 2020

Dr. Enrico Rinaldi (Visiting Scientist (Industry), iTHEMS)

With non-perturbative lattice calculations we investigate the finite-temperature confinement transition of a composite dark matter model. We focus on the regime in which this early-universe transition...more

Venue: via Zoom

Event Official Language: English

## A PDE model for the localization and spread of flu in the human respiratory tract

October 14 at 10:00 - 11:00, 2020

Mr. Christian Quirouette (PhD student, Department of Medical Physics, Ryerson University, Canada)

Within the human respiratory tract (HRT), virus diffuses through the periciliary fluid (PCF) bathing the epithelium. But it also undergoes advection: as the mucus layer sitting atop the PCF is pushed ...more

Venue: via Zoom

Event Official Language: English