NPA Seminar
NPA Seminar
Seminar on Nonlinear Phenomena and Analysis
九州大学伊都キャンパスにて不定期に現象数理セミナー（NPＡセミナー）を開催しています。応用や現象に関連した解析の話題を広く取り上げる予定です。多くの方々のご参加をお待ちしております。
セミナー幹事：手老篤史、福本康秀（九大MI研究所）
連絡先：手老 篤史（tero(at)imi.kyushu-u.ac.jp）
現象数理セミナー予定
通常 木曜不定期15:30-17:00・
（日時・場所は変更になることがあります）
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https://sites.google.com/site/npaseminar/
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第108回現象数理セミナー
日時：8月28日(月) 14:30-16:00
場所：「C513中講義室」
1つ目：14:30-16:00
講演者：Prof. Yi Zhang
[Zhejiang Normal University (浙江師範大学), 中国]
題目: Bidifferential calculus approach to N-component NLS equations and their solutions
要旨:
In this talk, in the framework of bidifferential calculus, we investigate the N-component NLS equations via a matrix version of the binary Darboux transformation, which involves a Lyapunov equation. When the spectral matrix is in the form of diagonal or Jordan block, the corresponding matrix solution of the Lyapunov equation is given. From vanishing and nonvanishing seed solutions, abundant soliton solutions, including breathers, positon solutions, semi-rational rogue waves, and dark solitons, are provided.
2つ目：16:00-17:30
講演者：Prof. Alex Klimenko
[The University of Queensland, オーストラリア]
題目: Why time has an arrow?
要旨:
The physical mechanisms enacting the direction of time remain one of nature's most guarded secrets. The two principal factors --- evident profound outcomes and physical mechanisms deeply hidden somewhere in the quantum world --- create a sense of “time flow”, which, in fact, is a powerful illusion. This illusion is very useful in day-to-day life and even in most scientific explorations but creates numerous difficulties when we try to analyse time. When dealing with such a complex issue as the direction of time it is important to ask the right questions before correct answers can be found. In this presentation, we will try to answer the following three questions:
1. Does entropy increase forward in time or does time “flow” in the direction of entropy increase?
2. Is the low entropy origin of the Universe sufficient to explain the temporal asymmetry?
3. Can asymmetry of the directions of time and matter/antimatter asymmetry be related?
We will consider alternative answers to these questions, their implications and opinions expressed by prominent scientists and intellectuals (Boltzmann, Reichenbach, Popper, Hawking, Penrose, Price,…). We will illustrate these questions through thought experiments and discuss the possibility of testing the answers by experiments from the real world. We will conclude by presenting the fundamental alternatives that can shape our understanding of the world around us.
セミナーHP:
https://sites.google.com/site/npaseminar2/
セミナー幹事：手老篤史、福本康秀（九大MI研究所）
連絡先：手老 篤史（tero(at)imi.kyushu-u.ac.jp）
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