vol. 115 | iTHES

Vol. 115, February 22nd, 2016


  • Announcement
  • Upcoming Events
  • Paper of the week

Paper of the week

Hironori Mori and Akinori Tanaka


Varieties of Abelian mirror symmetry on RP2×S1

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.


"Commentary: New mathematical physics needed for life sciences"
by David Holcman and Zeev Schuss
This is an interesting recent article in Physics Today 69(1), 10 (2016)
The idea is quite in line with the founding philosophy of iTHES:

Upcoming Events

The 8th iTHES Academic-Industrial Innovation Lecture
Date: March 1st (Tue.)
Place: Nishina Hall, Wako, RIKEN
Company: JSOL

“ICA (Independent Component Analysis) and the Big Bang”

Date: March 3(Thursday), 2016, 15:00 - 17:00
Place: 3F S305 seminar room, BSI Central Building
Speaker: Prof. Jean-Francois Cardoso
(Telecom ParisTech/CNRS, University Paris 7, Cosmology)

In 2013, the Planck collaboration from the European Spatial Agency released its first results and products, including a full-sky high-resolution map of the Cosmic Microwave Background (CMB) which made the headlines of newspapers worldwide. Indeed, that image is quite literally a snapshot of our Universe in its infancy, when it was a promising but fragile baby, only 380.000 years old. The CMB map is obtained by combining the 9 frequency channels of the Planck satellite in order to separate the precious relic radiation from many other astrophysical emissions. This is a source separation issue which, as it turned out, was best solved by a blind method -- in other words, by ICA:
Independent Component Analysis-- carefully crafted to deal with the uncertainties in the sky and the wild SNR conditions in the data.
The talk will start with an introduction to Big Bang theory, the standard cosmological model, so beautifully supported by Planck results. I will then describe the Planck satellite and sketch its data processing pipeline up to the inference of the cosmological parameters. I will focus on my main contribution to it: blind separation of the CMB from all the other emissions by an ICA algorithm based on a Gaussian spectral likelihood.

Host: Shun-ichi Amari
Lab. for Mathematical Neuroscience (ext. 7142)

12th International Conference on Low Energy Antiproton Physics (LEAP2016)
Date: March 6-11, 2016
Place: Kanazawa Japan

The intent of LEAP 2016 is to actively stimulate the overlap and dialogue between various research forefronts in the diversified field of antiproton physics and related field involving meson and baryon with strangeness.
iTHES is a cosponsor of this meeting.
Feel free to join !

"LIGO Gravitational Wave Detection Seminar"
Date: March 7 (Mon) 2016 16:00-
Place: BSI Ikenohata Building, 3rd floor, large conference room
Speaker: Prof. Kipp Cannon (RESCEU, The Univ. of Tokyo; LIGO member)
Contact: Kazuo Maxima (maxima@phys.s.u-tokyo.ac.jp)

iTHES Symposium
Baymfest in Tokyo:
"Exploring Extreme Forms of Matter - A symposium in honor of Professor Gordon Baym -"
Date: March 14 (Mon) 2016. 10:00am-
Place: Faculty of Science 4th-bldg 1320, Department of Physics, The University of Tokyo

This is a joint symposium hosted by The University of Tokyo and RIKEN on nuclear physics, condensed matter physics and astrophysics in hornor of Prof. Gordon Baym's 80th birth year. We welcome participation of all scientists who are interested in these fields and related interdisciplinary research. We hope to have fruitful discussions on the current status and future perspectives in these fields at the symposium.

3rd mini-symposium on Computations, Brains and Machine
Date: March 17, 2016, 1:30 pm -
Place: the seminar room, 1F, at BSI Central Building

Brain does amazingly efficient computation over big and complex information, while modern neuroscience itself often requires such computations for analyzing the data, to address mysteries of brain. To gain the insights for uncovering the superb neuro-computational principles and intelligence, the series of this mini-symposium is intended to discuss better computations and greater mathematical principles in a wider perspective, not only in theoretical neuroscience but also in machine learning and statistical-information sciences. This time, four eminent speakers will introduce us to cutting-edge works to face such challenges in their own disciplines. Who knows that these perspectives might be integral for future neuroscience?

13:30-13:35 Opening
13:35-14:20 Dr. Yoshimasa Tsuruoka (The University of Tokyo):
Recent Advances in Natural Language Processing and Game AI
14:20-15:05 Dr. Mahito Sugiyama (Osaka University):
Statistical Analysis on Order Structures
15:30-16:15 Dr. Makoto Yokoo (Kyushu University):
Market Design: Designing Social System by Game Theory
16:15-17:00 Dr. Tetsuya Ogata (Waseda University):
Deep Neural Models for Multimodal Integration in Robot System
17:00-17:45  Informal discussion (at Nakahara Lab/N201)

Person of the Week

Varieties of Abelian mirror symmetry on RP2×S1
by Hironori Mori and Akinori Tanaka

We study 3d mirror symmetry with loop operators, Wilson loop and Vortex
loop, and multi-flavor mirror symmetry through utilizing the RP2×S1
index formula. The key identity which makes the above description work
well is the mod 2 version of the Fourier analysis, and we study such
structure, the S-operation in the context of a SL(2,Z) action on 3d
SCFTs. We observed that two types of the parity conditions basically
associated with gauge symmetries which we call P-type and CP-type are
interchanged under mirror symmetry. We will also comment on the T-operation.