Earth Top and Spin Rotation

Greetings.

Today I prepared some academic documents to submit, so that I did not have time to take a sufficient rest.

Indeed, we had another earthquake (fortunately far southern to Japanese islands and Tokyo) with Magnitude M=7.0. As the Energy Magnitude is (in a conventional definition) defined as a logarithmic scale of effective Joule energy, we had 1/1000 times Energy if compared to that of the Tohoku earthquake (M=9.0).



The image above "The Earth Top" (taken by me) is what I am preparing for the last two lectures of dynamics and electro-magnetics at the year 2012 (Winter semester of 2011) at Tokyo. We will compute the inertia momentum "I", diagonalization by diag(I1, I2, I3) for non-symmetric gyro top, and the introduction of the coordinate transformation.

Galileo's episode (made up by historians?) is quoted as "Yes, that's right" (Answer to "Isn't the earth moving?") This saying has several variations, such as "Yet the earth does move." However, at the era of Galileo Galilei, it was still possible to study mechanics as a mathematical hypothesis like the heliocentric model by Nicolaus Copernicus in the 15C's and 16C's. Galileo's accused point [1564-1642] was to study his relativity principle (coordinate changes between two inertia frames) as a guiding principle of real-world problem.

I wish a happy new year and good documents for (special) relativity.

Newton's Festival at University of Tokyo

Dear friends;

My homepage is temporarily closed for some reasons (, but I preserve its files and information). For almost one year, I worked for my mathematics lecture [brush-up and undergraduate mathematics at the summer semester] as well as my physics lecture [brush-up and introduction to dynamics / analytical mechanics (including some classical integrable systems of tops with inertia momentum tensor), and electro-magnetic special relativity at winter semester].

Here is some mini-blogs (I'm sorry it is written in Japanese) for this year; I have a Facebook account for more English posts (or sometimes in French, German, or Japanese [from Twitter or Android cell phone]).

http://twilog.org/makotosakuraijp/

My old diary described my trip to a university of Japan, which had an "apple tree of Newton". Today was the "Newton Festival 2011" of Department of Physics, the University of Tokyo. However, as I explained above, I could not leave the lecture until 18:15, so that I could not attend the party at Sanjo-Kaikan (山上会館) in the Hongo Campus of University of Tokyo.

As all of you must know, Japan is under the revival from the Tohoku earthquake at 11-March-2011, 14:46, and the nuclear crisis afterwards. (I explained some of the radioactivity information and radioactivity protection to my colleagues and students.) Therefore, I could not travel much for conferences or workshops far from Tokyo, so that it was very difficult to keep my research activity.

I wish you would have happy holidays and a "better" new year!

Best wishes,

Makoto Sakurai

Japanese Rising Sun 2011

The sun is rising. I had observed before the dawn to the sunrise of New Year's Day 2011. The photos are listed anti-chronologically.

Have happy holidays and a good new year.

Makoto Sakurai

Japan Physical Society 2010 Fall in Kyushu

The Japan Math-Phys Society became separated after the Nobel winning paper by Yukawa at about 75 years ago. So my presentation to JPS (Japan Physical Society) is the first time since I did at the year 2006; which was a joint meeting with USA at Hawaii. (See the past blog.)

In this week, I visited the Kyushu-Kogyo University by staying only 2(+1) days in a hotel near Kokura (小倉:bullet train station). The travel was nice, because I took a very-early-morning flight from Haneda to Kita-Kyushu; my flight was the retirement of the aircraft (type MD87) for 25 years, whose schedule for departure was 5 minute delayed, but the arrival was just on time. (The speed of flight was 820 km/hour: the second figure is the Kohu-basin 甲府盆地) Then the third figure is the mono-rail and bullet-train stain Kokura seen from the station square.

Then I took a shuttle bus, early-checked-in at the hotel for suit case, and checked the way to the university presentation room. It (Sep-12) was Sunday and we just have accelerator experimentalists and I heard a public lecture at the auditorium.

The second day was by the lattice gauge theory, quantum integrable systems, AdS/CFT, and quantum mechanics. I heard some physics discussions by senior staffs, and I had become very exhausted.

The final day was my presentation day at the string theory session, for the illumination of my past 2-3 years of development of "pure math" to see how the S-duality conjecture is seen from an algebraic-geometer with some physics background. The slide is available at:
Moduli space of chiral conformal field theories and compactification to Kahler manifolds

The final figure is the panel guiding the participants to the presentation halls.

Virtual visit at KITP California, QFT and Langlands

Langlands-Type Dualities in Quantum Field Theory, KITP, California, USA, Aug 9, 2010 - Aug 27, 2010 is delivering the videos (and lecture notes) in several formats at the wikispace. This conference is more on physi-cians' mathematics on low dimensional topology (or sometimes with extra dimensions or relative dimension of embeddings).

Unfortunately, I do not have time nor budgets to travel this month, but I hope to learn (and contribute to in some sense) something fruitful in this occasion. My old colleagues and friends attend the meetings, so I will do what I can do by myself.

Jet sky and Differential Graded Lie Algebras

Today I have a fine sky at Komaba, Tokyo and I am going to visit the string topology of Voronov at Kashiwa campus of University of Tokyo. The video is the jet sky over the ground of Komaba campus, where we have an "open campus".

Rainbow Connection

Today's post is a déjà-vu of Strings 2005 conference in Toronto.

See the original: 3rd day of Strings 2005