vol. 111 | iTHES

Vol. 111, January 25th, 2016


  • Upcoming Events
  • Event report
  • Paper of the week

Paper of the week

Shin-ichi Sasa, Yuki Yokokura


"Thermodynamic entropy is the Noether invariant"

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

iTHES Seminar
Date: Jan.25 (Mon) 15:30-
Place: room 433 (Main research building)
"A mathematical model of molecular mimicry and autoimmune disease"
Prof. K. Tokita (Nagoya Univ.)

Computaional Brain Sciecene WS
Date: Jan.28 (Thu) 13:30-17:40
Place: Seminar room, 4th floor, Brain Science Central Bldg.

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

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.

Event report

Report on a “Thinkshop”, Transient Bormio 2016
By S. Nagataki

I attended a “Thinkshop” held in Bormio, Italy, during 17-22 January, 2016. This was a meeting to “think” together what we are interested in. We heard some talks in the morning. Based on the morning sessions, we had 2 hours and half for discussions in the evening (we had a free afternoon for free discussions & fun). The topic of the meeting was “transients” such as supernova explosions, gamma-ray bursts, fast radio bursts, magnetar flares, crab flares, and so on. As for the evening sessions, a convener was assigned each day to lead the discussions. In the beginning, the conveners encouraged to start discussions, but the conveners had to stop the continuous & endless discussions in the end every day. During the meeting, I considered about the “endless discussion” itself, rather than what we talked there. Usually, “endless discussions” do not solve unsolved problems. In fact, we just left unsolved problems on Transients as unsolved ones even after the long discussions. However, can we say that such endless discussions are useless and just loss of time? Here, there may be something important. I am still in Bormio, and after long discussions and chatting, I pretend to be brave to mention about this point more clearly: there might be something different between West (Europe & America) & EAST (especially East Asia). In this meeting, I was a single man from Asia. 2 Asian women participated in the meeting although they are working in the US. The rest of participants (about 50) were from Europe or America, and all of them were “White” (probably such a meeting is not accepted usually, but this time was OK since this meeting was a closed one and only invited people could participate in it). The “White” participants were enjoying endless discussions and chatting from morning to evening every day “without” finding solutions. Of course I know it is absurd to say that East Asian do not like discussions & chatting. Simultaneously, however, I felt that there is something that I cannot ignore on the difference between West & East. At least, I think iTHES will become better if we can introduce such free atmosphere more.

I found that Bormio is a kind of a “secret place” only for White people. In Bormio, it is hard to find Asian and Black people. Here, people are enjoying ski and spa. I enjoyed one of the famous spas. It was really fantastic. There, again, I was a single Asian (probably most would be Italian). I felt that I stepped in a very secret, special place only for White people. This situation might be similar to the special resort places only for Japanese such as hot springs in domestic regions of Japan where only Japanese are available and no one can speak foreign languages. “Diversity” is very important, of course. However, simultaneously, I felt how great such special, secret places & situations are. This is, we can say, “Culture”. I attach two photos of Bormio. You can find a spa in one of them. But this is just one of baths there. There are plenty of baths there, and I have to say that it is hard to find such baths in Japan (of course, on the other hand, it is pretty hard to find very beautiful & quiet baths & hot springs like Japanese ones even in Bormio. Every time I visit foreign countries, I feel that Japan is a really beautiful country). I learned that Italian have loved hot springs historically. Interestingly, I feel a kind of “similarity” between Italian and Japanese when I visit Italy. This is really interesting. Difference between West & East. Similarity between Japanese & Italian.

Person of the Week

"Thermodynamic entropy is the Noether invariant"
Shin-ichi Sasa, Yuki Yokokura

We study a classical many-particle system with an external control represented by a time dependent parameter in a Lagrangian. We show that thermodynamic entropy of the system is the Noether invariant associated with a symmetry for an infinitesimal non-uniform time translation t→t+η?β, where η is a small parameter, ? is the Planck constant, β is the inverse temperature that depends on the energy, and trajectories in the phase space are restricted to those consistent with quasi-static processes in thermodynamics.