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Book on
Dr. Koutarou Kyutoku thumbnail

Book on "Origins of the Gravitational Wave"

2018-09-10

Kotaro Kyutoku (Assistant Prof. in KEK and iTHEMS visiting researcher. Former iTHEMS SPDR) has published a book "Origins of the Gravitational Wave" in Japanese with Masaru Shibata (Max Planck Institute and Kyoto Univ.).
It contains excellent explanations on general relativity and black holes, structure of neutron stars, supernova explosion, gamma-ray burst, gravitational wave, mergers of black holes and neutron stars, and current/future gravitational wave detectors on earth and space.
Everybody who is interested in GW should have one in his/her bookshelf. English translation will be called for.

Press Release

An unstable isotope Technetium-98 (98Tc) could be synthesized by neutrinos emitted from supernova explosions thumbnail

An unstable isotope Technetium-98 (98Tc) could be synthesized by neutrinos emitted from supernova explosions

2018-09-11

A joint research group consisting of Masaomi Ono, a Research Scientist at RIKEN, and others has theoretically predicted that an unstable isotope Technetium-98 (98Tc) could be synthesized by neutrinos emitted from supernova explosions.
Supernovae are important events in the evolution of stars and galaxies, but the details of how the explosions occur are still unknown. This research found a method to investigate the role of electron anti-neutrinos in supernovae. By measuring the amount of 98Ru (an isotope of Ruthenium) in meteorites, it should be possible to estimate how much of its progenitor 98Tc was present in the material at the time when the Solar System formed. The amount of 98Tc in turn is sensitive to the characteristics, such as temperature, of electron anti-neutrinos in the supernova process; as well as to how much time passed between the supernova and the formation of the Solar System.
(This work appeared in Physical Review Letters on Sept. 4, 2018.)

Caption: We can estimate the age of heavy elements in the primordial Solar System by measuring the traces left in meteorites by specific radioactive nuclei synthesized in certain types of supernovae.
Credit: NAOJ (National Astronomical Observatory of Japan)

Reference

  1. Public Release: 3-Sep-2018

Upcoming Events

Lecture

Introduction to Random Matrix Theory 1 thumbnail

Introduction to Random Matrix Theory 1

September 25 at 10:00 - 16:30, 2018

Dr. Taro Kimura

Venue: #435-437, Main Research Building, RIKEN

Event Official Language: Japanese

Lecture

Introduction to Random Matrix Theory 2 thumbnail

Introduction to Random Matrix Theory 2

September 26 at 10:00 - 16:30, 2018

Dr. Taro Kimura

Venue: #435-437, Main Research Building, RIKEN

Event Official Language: Japanese

Colloquium

iTHEMS Colloquium

Economic Networks: a Physicist's View

October 3 at 15:00 - 16:30, 2018

Prof. Hideaki Aoyama (Senior Visiting Scientist, iTHEMS)

Economic phenomena occur on networks formed by agents, such as firms and financial institutions. In order to understand the dynamic nature of economy, we need to understand structures of those networks and interactions between economic agents on it. In this talk, I will review several important research results on this theme, most of which uses Japanese rich, actual (not simulated) network data, including trade (production) network of about one million firms. Community structures, simulation of effect of natural disasters, new methodology required for such inquiry are some of the topics to be covered.

Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria), RIKEN

Broadcast: R511, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN / SUURI-COOL (Kyoto), #204-205, 2F Maskawa Building for Education and Research, North Campus, Kyoto University / SUURI-COOL (Sendai), #303, 3F AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

Math Lecture

Dr. Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (4th)

October 18 at 15:30 - 17:00, 2018

Dr. Yosuke Kubota (Research Scientist, iTHEMS)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: Japanese

Math Lecture

Dr. Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (5th)

November 8 at 13:30 - 15:00, 2018

Dr. Yosuke Kubota (Research Scientist, iTHEMS)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: Japanese

Workshop

Supported by iTHEMS

Workshop on Recent Developments of Chiral Matter and Topology

December 6 - 9, 2018

The aim of this workshop is to gather researchers of high-energy and condensed-matter physics working on chiral Matter and Topology, to exchange ideas and establish collaborations to tackle unsolved issues and carry out future extensions. The workshop expects to welcome 40-60 participants who are interested in the aforementioned topics.

Organizers:
Tomoki Ozawa, Tetsuo Hatsuda (RIKEN iTHEMS)
Di-Lun Yang (RIKEN Nishina Center; YITP, Kyoto)
Chang-Tse Hsieh (Kavli IPMU / ISSP, the Univ. of Tokyo)
Jiunn-Wei Chen, Guang-Yu Guo (National Taiwan Univ.)
Hsiang-Nan Li (Academia Sinica)

Venue: National Taiwan University, Taipei, Taiwan

Event Official Language: English

Math Lecture

Dr. Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (6th)

December 20 at 15:30 - 17:00, 2018

Dr. Yosuke Kubota (Research Scientist, iTHEMS)

Title: An introduction to operator algebras

Abstract: Operators are linear maps from a (usually an infinite dimensional) linear space (most frequently the Hilbert space) to itself, which is like matrices of infinite degree. Operators form an algebra by obvious addition and multiplication. Operators appear in most of the fields in mathematics, in algebra, in geometry, in analysis, ... Some of the key words at the beginning of these lectures are "spectral theory" "operator algebras" "Tomita-Takesaki theory". These lectures are for non-professional people.

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: Japanese

Person of the Week

Dr. Gen Kurosawa thumbnail

Self-introduction: Gen Kurosawa

2018-09-10

My name is Gen Kurosawa. I study “Biological Timing”. We know timing of meal influences timing of sleep. Similarly, we know timing of taking medicine influences its efficacy. We know these facts, but we do not really know why. To answer these questions, my approach is to use two types of models. Mainly, I try to develop simpler models to understand the essence in Biological Timing. Simultaneously, I use realistic models (ex. 180 variable ODE model with genes and proteins) to make detailed predictions which can be tested experimentally in a very near future. At iTHEMS, I am happy that I can interact with colleagues from various disciplines.

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