セミナー

Math-Fi seminar on 13 Jul.

2017.07.11 Tue up
  • Date: 13 July (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Yoshihiro Ryu(Ritsumeikan univ.)
  • Title: An introduction to quantum stochastic analysis
 

Math-Fi seminar on 6 Jul.

2017.07.04 Tue up
  • Date: 6 July (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Kenji Yasutomi (Ritsumeikan univ.)
  • Title: standard probability space and “standard  measurable space”
  • Abstract: In this talk, “standard measurable space” means “standard probability space without probability measure”.Since the “standardness” depends on probability measure, this is not so trivial. This kind of spaces are good for somethings, for example, for regular conditional probability, for independent complement.And, the spaces are enough common. Actually it include any Polish spaces.
 

Math-Fi seminar on 22 Jun.

2017.06.20 Tue up
  • Date: 22 June (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Takahiro Aoyama (Okayama univ.)
  • Title: Composed order statistics and multivariate compound Poisson processes

2017年6月16日(金) 立命館大学幾何学セミナー

2017.06.13 Tue up
日時： 2017年6月16日(金) 15:00～17:15
場所： 立命館大学びわこ・くさつキャンパス(BKC) ウェストウィング6階 談話会室

講演①（15:00～16:00）
タイトル：Heidenberg 群上の(Sub-)Laplacian に対する熱核の展開公式とその応用

講演者：岩崎千里 （兵庫県立大学）

アブストラクト：
Heisenberg 群上のLaplacian およびSub-Laplacian に対する熱方程式の基本解をワイル表象を使って擬微分作用素として書き表すことにより，固有関数展開の手法が適用できることを示す．
この結果をHeisenberg 群上のform に作用するLaplacian の基本解の表示に応用する．

講演②（16:15～17:15）
タイトル：Band rearrangement against a control parameter through Dirac equations with boundary conditions

講演者：岩井敏洋 （京都大学）

アブストラクト：
An elementary band rearrangement or energy level redistribution takes place between two adjacent bands and any band rearrangement can be regarded as composed of elementary ones.
Band rearrangement can be viewed as a global topological change which is a collection of local contributions observed at critical points.
The local topological change can be detected by the linearization method applied at each critical point.
Dirac equations show up in this context as linear equations for the study of elementary band rearrangements.

The Dirac equations of space-dimension one, two, and three are studied under both the APS (Atiyah-Patodi-Singer) and the chiral bag boundary conditions, where bounded domains are an interval, a disk, and a ball, respectively, and where mass is treated as a parameter ranging over all real numbers.
Discrete symmetry of the boundary condition and the Hamiltonian are discussed to explain the symmetry observed in the pattern of change in eigenvalues against the parameter.
Related topics will be touched upon, including topological insulator in quantum physics.
This talk is based on joint works with B. Zhilinskii at Université du Littoral Côte d’Opale.

Math-Fi seminar on 16 Jun.

2017.06.12 Mon up
  • Date: 16 June (Fri.)
  • Place: W.W. 7th-floor, 4th lab.
  • Time: 16:30-18:00
  • Speaker: Toshiki Okumura (The Dai-ichi Life insurance Company, Limited)
  • Title: On a construction of strong solutions for stochastic differential equations with non-Lipschitz coefficients; a priori estimates approach
  • Abstract: Given a stochastic differential equation of which coefficients satisfy Yamada-Watanabe condition or Nakao-Le Gall condition. We prove that its strong solution can be constructed on any probability space using a priori estimates and also using Ito theory based on Picard’s approximation scheme. 
 

Math-Fi seminar on 8 Jun.

2017.06.06 Tue up
  • Date: 8 June (Thu)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Jiro Akahori (Ritsumeikan univ.)
  • Title: TBA

Math-Fi seminar on 19 May

2017.05.18 Thu up
  • Date: 19 May (Fri)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Hideo Nagai (Kansai univ.)
  • Title: Large deviation control arising from downside riskminimization against a benchmark
  • abstract: 

Math-Fi seminar on 11 May

2017.05.10 Wed up
  • Date: 11 May (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Tatsuki Akiyama, Arturo Kohatsu-Higa and Takuya Nakagawa
 

Math-Fi seminar on 20 Apr.

2017.04.18 Tue up
  • Date: 20 Apr. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Kazuhiro Yoshikawa (Ritsumeikan univ.)
  • Title: TBA
 

Math-Fi seminar on 13 Apr.

2017.04.13 Thu up
  • Date: 13 Apr. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Keita Owari (Ritsumeikan univ.)
  • Title: A Komlós-Type Result in Dual Orlicz Spaces
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