RIKEN Day: Let's Talk with Researchers! "The Wonder of Numbers"

March 17 (Sun) at 14:00 - 16:00, 2019

Ade Irma Suriajaya (Special Postdoctoral Researcher, iTHEMS)

In the March RIKEN Day, we will have a talk with Ade Irma Suriajaya, a mathematician who is researching "prime numbers", on the theme of "the wonder of numbers". See related links for details.

Venue: Science Museum

Event Official Language: Japanese

On special values of the multiple zeta functions of Arakawa-Kaneko type

March 16 (Sat) at 15:00 - 17:30, 2019

Yasuo Ohno (Professor, Mathematical Institute, Tohoku University)
Yuta Suzuki (JSPS Research Fellow, Graduate School of Mathematics, Nagoya University)

15:00~16:00: Yasuo Ohno (Tohoku University) "On special values of the multiple zeta functions of Arakawa-Kaneko type" Arakawa-Kaneko's zeta function is a kind of generalization of the Riemann zeta function by using polylogarithms. I am planning to introduce two topics on combinatorics around its values at positive or negative integral points. This talk is based on joint work with N. Kawasaki. 16:20~17:20: Yuta Suzuki (Nagoya University) "On relatively prime amicable pairs" A famous Greek mathematician, Pythagoras tried to find symbolical meanings in numbers. One famous example of such symbolism in numbers is amicable pair, which was introduced as a symbol of friendship. A pair of positive integers $(M,N)$ is called an amicable pair if the sum of all divisors of $M$ except $M$ itself is equal to $N$ and the sum of all divisors of $M$ except $N$ itself is also equal to $M$. The smallest example is $(220,284)$. Even amicable numbers are introduced more than 20 centuries ago, most of their properties are still unknown. For example, the infinitude of amicable pairs has not yet been proven. In this talk, we pick up a conjecture of Gmelin (1917), which claims that there is no relatively prime amicable pairs, and try to introduce some atmosphere of "modern elementary number theory". In particular, we improve Pollack's partial result (2015) on Gmelin's conjecture.

Venue: Seminar Room #160

Event Official Language: English

The 2nd International Workshop on Quantum Many-Body Problems in Particle, Nuclear, and Atomic Physics

March 7 (Thu) - 11 (Mon), 2019

Venue: University of Khanh Hoa, Nha Trang City, Vietnam

Event Official Language: English

Introduction to Public-Key Cryptography (9th)

March 6 (Wed) at 13:30 - 15:00, 2019

Eren Mehmet Kıral (Visiting Scientist, iTHEMS / Visiting Scientist (JSPS Research Fellow), Faculty of Science and Technology, Sophia University)

Venue: Seminar Room #160

Event Official Language: English

Workshop of Nuclear-Astrophysics by UKAKUREN/Japan Forum of Nuclear Astrophysics (JaFNA): Nuclear data & Heavy Element Nucleosynthesis

March 6 (Wed) - 8 (Fri), 2019

We are pleased to announce that we will have a meeting on Nuclear-Astrophysics at Hokkaido Univ. Especially this time we will focus on the impact of nuclear data & nucleosynthesis of heavy elements. Gravitational wave is another keyword. This workshop is held by UKAKUREN (JaFNA), together with Nuclear Reaction Data Centre, Hokkaido University (JCPRG). This workshop is supported by iTHEMS, CNS, RCNP, NAOJ, KEK, and WNSC. You are welcomed to join us. For registration, please fill in the attached form (in Japanese) and send it to: sec-ukakuren18@kek.jp by 30th November 2018. We are looking forward to seeing you at Hokkaido U. Organizers T. Kajino (Chair), T. Kawabata (Osaka), H. Utsunomiya (Konan), S. Nishimura (RIKEN), H. Yamaguchi (CNS), T.Hayakawa (QST), T.Motobayashi (RIKEN), K.Terada(Osaka), S.Nagataki(RIKEN), S.Chiba(TIT), T.Tamagawa(RIKEN), W.Aoki(NAOJ), S.Wanajo(AEI), S.Kubono(RIKEN), T.Shima(RCNP)

Venue: Hokkaido University Conference Hall

Event Official Language: Japanese

Theory of Operator Algebras (9th)

March 5 (Tue) at 15:30 - 16:30, 2019

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

Event Official Language: Japanese

Theory of Operator Algebras (8th)

March 5 (Tue) at 14:00 - 15:00, 2019

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

Event Official Language: Japanese

Joint value distribution of quadratic L-functions (joint work with Hirofumi Nagoshi)

February 25 (Mon) at 16:20 - 17:20, 2019

Hidehiko Mishou (Tokyo Denki University)

In 1975, Voronin established the universality theorem for the Riemann zeta function. Roughly speaking this theorem asserts that any holomorphic function on 1/2

Venue: Seminar Room #160

Event Official Language: English

Symmetric Tornheim double zeta functions

February 25 (Mon) at 15:00 - 16:00, 2019

Takashi Nakamura (Tokyo University of Science)

Let $s,t,u \in {\mathbb{C}}$ and $T(s,t,u)$ be the Tornheim double zeta function. We investigate some properties of symmetric Tornheim double zeta functions. As a corollary, we give explicit evaluation formulas for $T(s,t,u)$ in terms of series of the gamma function and Riemann zeta function.

Venue: Seminar Room #160

Event Official Language: English

Tropical Rain Forest

February 21 (Thu) at 15:30 - 17:00, 2019

Akiko Satake (Professor, Mathematical Biology Laboratory, Department of Biology, Faculty of Science, Kyushu University)

In a unique phenomenon restricted to the tropical rain forests in Southeast Asia, hundreds of plant species from dozens of families reproduce synchronously at irregular, multi-year intervals. Although several hypotheses have been proposed, the proximate environmental cues that synchronize these general flowering events are uncertain. Fortunately, accumulation of long-term data and advanced statistical and modeling techniques are starting to shed new light on phenology of tropical plants. In this talk, series of studies that integrate long-term field monitoring, gene expression analyses, and modeling will be presented.

Venue: Okochi Hall

Broadcast:#311, Computational Science Research Building / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)

Event Official Language: English

The 7th MACS Colloquium

February 7 (Thu) at 15:00 - 17:30, 2019

Akira Tsuchiyama (Professor, Division of Earth and Planetary Sciences, Graduate School of Science/Faculty of Science, Kyoto University)

15:00- Teatime 15:15- MACS Report Meeting FY2018 16:40- Talk by Prof. Akira Tsuchiyama The 7th MACS colloquium is supported by iTHEMS. It will be broadcasted to Wako, but if you can join the colloquium physically in Kyoto, that would be better. iTHEMS provides good confectionary at Kyoto!

Venue: Lecture room #401, Graduate School of Science Building No 6, Kyoto University

Event Official Language: Japanese

Introduction to Public-Key Cryptography (8th)

February 7 (Thu) at 13:30 - 15:00, 2019

Eren Mehmet Kıral (Visiting Scientist, iTHEMS / Visiting Scientist (JSPS Research Fellow), Faculty of Science and Technology, Sophia University)

Venue: Seminar Room #160

Event Official Language: English

RIKEN-Berkeley WS on Quantum Information Science (RB19)

January 25 (Fri) - 29 (Tue), 2019

Initiated by the RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) program at Berkeley, this workshop will focus on the development of quantum computing techniques, quantum materials, and quantum sensing, as well as their corresponding applications to physical sciences, with an emphasis to galvanize the participants into future collaboration. Organizing Committee: Chia Cheng Chang (RIKEN iTHEMS/UCB/LBNL NSD) Takumi Doi (RIKEN iTHEMS) Tetsuo Hatsuda (RIKEN iTHEMS) Wick Haxton (UCB/LBNL NSD/RIKEN iTHEMS) Alan Poon (LBNL NSD/BQ) Advisory Committee: Jonathan Carter (LBNL CRD/BQ) Yasunobu Nakamura (RIKEN CEMS/Tokyo) Franco Nori (RIKEN/Michigan) Thomas Schenkel (LBNL AT-AP/BQ) Irfan Siddiqi (UCB/BQ) Seigo Tarucha (RIKEN CEMS/Tokyo) Co-hosted by RIKEN iTHREMS　 RIKEN CEMS　 Lawrence Berkeley National Lab. (LBNL)　 Univ. of California at Berkeley (UCB)　 Supported by Berkeley Quantum (bq)　 US Dept. of Energy (DOE)　

Venue: Lawrence Berkeley National Laboratory (Berkeley, California)

Event Official Language: English

The 7th International Symposium on Data Assimilation (ISDA2019)

January 21 (Mon) - 24 (Thu), 2019

The symposium will focus on the cross-cutting issues shared in broad applications of data assimilation from geoscience to various physical and biological sciences. In particular, the symposium will enhance discussions among researchers with various background on, for example, non-Gaussian and nonlinear data assimilation problems, Big Data Assimilation (BDA), high-performance computation (HPC), Uncertainty Quantification (UQ), advanced intelligence (AI) and machine learning, multi-scale and multi-component treatments, observational issues, and mathematical problems. Abstract Submission Deadline: October 14, 2018 at 11:59 p.m. UTC Registration Deadline: December 16, 2018 at 11:59 p.m. UTC Submission/Registration Fee: Free

Venue: 6F auditorium, Computational Science Research Building

Event Official Language: English

Introduction to Public-Key Cryptography (7th)

January 18 (Fri) at 15:00 - 17:00, 2019

Eren Mehmet Kıral (Visiting Scientist, iTHEMS / Visiting Scientist (JSPS Research Fellow), Faculty of Science and Technology, Sophia University)

Venue: Seminar Room #160

Event Official Language: English

Theory of Operator Algebras (7th)

January 10 (Thu) at 10:30 - 12:00, 2019

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

Event Official Language: Japanese

Universal clusters and Efimov physics

January 8 (Tue) at 10:30 - 17:00, 2019

Pascal Naidon (Senior Research Scientist, Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science (RNC))

Unlike classical systems, quantum few-body systems can be unbound in the presence of short-range attractive forces. Near the critical strength of the forces at which they can become bound (resonant forces), they exhibit universal properties that are independent of the details of the forces. In this lecture, I will explain in detail the universality of systems with resonant short-range forces, in particular the Efimov effect for 3 or more particles. I will also present the universal properties of systems with power-law interaction forces, such as van der Waals forces that are relevant to neutral atoms.

Venue: Brain Science Ikenohata Research Bldg. (3rd floor, C56)

Event Official Language: English