vol. 101 | iTHES

Vol. 101, November 9th, 2015


  • Upcoming Events
  • Paper of the week

Paper of the week

Nonrelativistic Banks-Casher relation and random matrix theory for multi-component fermionic superfuids


Takuya Kanazawa

From the Office

The office of iTHES assistant, Ms.Chikako Oota is situated at the second floor of the main research building, room # 246. The extension number is 3261. She will be at the office from 10 a.m. to 16 p.m.

Upcoming Events

13th iTHES Colloquium

November 10th (Tue.) 15:00-
"Complex Systems Modeling and its Applications"
Prof. Kazuyuki Aihara (The University of Tokyo)
Place: 2F Large mtg.rm, Main Cafeteria (Bldg. C61)
In this talk, I review our recent reseach on complex systems modeling and its transdisciplinary applications. First, I explain about a platform for mathematical modeling of complex systems, based on complex systems control theory, complex network theory, and big data analysis. Second, I illustrate examples of its transdisciplinary applications such as dynamical network biomarkers for preemptive medicine, transitive dynamics of the primate prefrontal cortex, and an electronic AD converter with beta expansion.

"The helium Efimov trimer and larger bosonic droplets"
Prof. Doerte Blume (Washington State University)
Date: Nov. 12th (Thursday) 2015 (14:00-)
Place: Main research building, 2th floor, 224
Language: English

The quantum mechanical three-body problem has been studied extensively for about a century. The helium atom (two electrons and a nuclues) and the molecular hydrogen ion (two protons and one electron) are textbook examples that illustrate the organization of the periodic table and molecular binding mechanisms, respectively. In 1970 Vitaly Efimov predicted a rather different and counterintuive quantum mechanical three-body binding mechanism that leads to an infinite series of stable three-body states of enormous spatial extents. These Efimov states are predicted to exist for short-range interactions like the van der Waals force between atoms or the strong force between nucleons. When the potential becomes so shallow that the last two-body bound state is at the verge of becoming unbound or is unbound, then three particles stick together to form Efimov states. This talk will review recent theoretical and experimental advances in this field. The observation of the helium trimer (three neutral helium atoms) Efimov state and extensions of the Efimov scenario to four- and higher-body systems will be discussed.

Detailed information can also be found in

Osaka CTSR - Kavli IPMU - RIKEN iTHES International workshop
"Nambu and science frontier"

Date: 17th November (Tue), 2015
Venue: H701 lecture room, Dept. of Physics, Osaka university
Time: 9:30 - 17:30

Invited speakers
Kenji Fukushima (U. Tokyo)
Koji Hashimoto (Osaka U)
Simeon Hellerman (Kavli IPMU)
Noriyoshi Ishii (Osaka U)
Kota Masuda (RIKEN iTHES)
Yu Nakayama (Kavli IPMU / Caltech)
Toshifumi Noumi (Hong Kong U. of Science and Technology / RIKEN iTHES)
Kin-ya Oda (Osaka U)
Noriaki Ogawa (RIKEN iTHES)
Haruki Watanabe (MIT)
Tamiaki Yoneya (U. Tokyo, Open Univ. of Japan)

Koji Hashimoto, Kentaro Nagamine (Osaka CTSR)
Tetsuo Hatsuda, Tsukasa Tada, Masato Taki (RIKEN iTHES)
Hitoshi Murayama (Kavli IPMU)

Purpose of the Workshop:
In July 2015, we as the physics community were greatly saddened by the news that Prof. Yoichiro Nambu had passed away. He proposed many of the fundamental concepts that underlie our current understanding in theoretical sciences. On this occasion, we’d like to discuss the relevance of Nambu’s concepts and how they will be developed in many areas of science, and promote interdisciplinary collaborations among theoretical sciences. The joint workshop of Osaka CTSR- RIKEN iTHES - Kavli IPMU is a successive series following the symposium held at Kavli IPMU last year.
The topic of the workshop includes:
- Nambu-Goto action for strings, membranes and higher dim. objects
- Nambu-Goldstone theorem and its extensions
- Nambu-Jona-Lasinio model and its generalizations
- Nambu-Bethe-Salpeter equation and nuclear/hadron physics
- Nambu bracket for quantizing membrane and M-theory
- Higgs inflation
- QCD chiral phase transition
- Symmetry breaking in physical biology

Sponsored by
- Core for Theoretical Science Research (CTSR) , Osaka Univ.
- Interdisciplinary Theoretical Science (iTHES) Research Group, RIKEN
- Kavli IPMU, The Univ. of Tokyo

The 7th iTHES Academic-Industrial Innovation Lecture

"Autonomous Car and Artificial Intelligence"
Dr. Toshiki Kindo (TOYOTA)
Date: Nov. 20(Fri.) 13:30-16:00
Place: Okochi Hall, Wako, RIKEN
(Lecture is given in Japanese.)

#16 Pioneer project seminar

"Precision Tests of Discrete symmetries at Low Energies"
Prof. Klaus Jungmann (University of Groningen)
Date: Nov. 24th (Tuesday) 2015 (10:00-11:00)
Place: Main research building, 5th floor, 535,537
Language: English

Fundamental Physics Using Atoms 2015
- Towards better understanding of our matter universe -

Nov. 30 (Mon.) -- Dec. 1 (Tue.), 2015
Oral sessions: RIKEN Wako, Okochi Hall (C32)
Poster sessions: Welfare and Conference Bldg. 2F (C61)

Recently much effort has been directed to investigation of the fundamental physics which exploits remarkable developments in atomic physics and/or quantum optics techniques. Examples include (A) test of the time reversal invariance by observing permanent electric dipole moments of atoms or molecules, (B) neutrino mass spectroscopy using atoms, (C) measurement of fine structure constant's time dependence with precession atomic clock etc. This conference aims to bring together recent research results, to discuss future prospects, and to expand research network, making this field more active and productive.

Paper of the week

Physics of multicomponent fermions has long been a focus of interest for nuclear and particle physicists. Recently it has become possible to realize nonrelativistic multicomponent fermions having a large symmetry group in laboratories by e.g., cooling Strontium and Ytterbium gases down to quantum degeneracy. In this paper we applied analytical methods developed in Quantum Chromodynamics (QCD) to the study of low-energy interacting fermions and derived a number of results that have direct counterparts in QCD, for example, an exact correspondence between a finite-volume partition function of Nambu-Goldstone modes and random matrix theory. We tested some of the analytical results with Monte Carlo simulations on a lattice and found a perfect agreement between theory and numerics, as shown in the figure.