Apr 2017-Mar 2018

Math-Fi seminar on 8 Mar.

2018.03.08 Thu up
  • Date: 8 Mar. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Go Yuki (Ritsumeikan University)

Math-Fi seminar on 15 Feb.

2018.02.14 Wed up
  • Date: 15 Feb. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Ngoc Khue Tran(Pham Van Dong University )
  • Title: Local asymptotic properties for CIR process and a jump-type CIR process
  • Abstract: 
​In the first part of this talk, we consider a Cox-Ingersoll-Ross (CIR) process whose drift coefficient depends on unknown parameters. Considering the process discretely observed at high frequency, we prove the local asymptotic normality (LAN) property in the subcritical case, the local asymptotic quadraticity (LAQ) in the critical case, and the local asymptotic mixed normality (LAMN) property in the supercritical case. To obtain these results, we use the Malliavin calculus techniques developed recently for CIR process by Alòs et al. and Altmayer et al.  together with the $L^p$-norm estimation for positive and negative moments of the CIR process obtained by Bossy et al. and Ben Alaya et al.
In the second part, we will discuss the local asymptotic properties for a jump-type CIR process driven by a Brownian motion and a subordinator, whose growth rate is a unknown parameter. LAN is proved in the subcritical case, LAQ is derived in the critical case, and LAMN is shown in the supercritical case. This is a joint work with Mohamed Ben Alaya, Ahmed Kebaier and Gyula Pap.

Math-Fi seminar on 25 Jan.

2018.01.17 Wed up
  • Date: 25 Jan.(Thu.)
  • Place: W. W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Yuichi Shiozawa (Osaka university)
  • Title: Upper rate functions of Brownian motion type for symmetric jump processes

Math-Fi seminar on 18 Jan.

2018.01.16 Tue up
  • Date: 18 Jan.(Thu.)
  • Place: W. W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Takanori Adachi (Ritsumeikan university)

Math-Fi seminar on 22 Dec.

2017.12.21 Thu up
  • Date: 22 Dec. (Fri.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Tai-Ho Wang
  • Title: Works in progress related to quantitative finance
  • Abstract: In this talk, I will introduce the projects that I am currently working on and their possible extensions. The first concerns the pricing of an exotic option called target volatility option in the fractional SABR model. Secondly, we concern ourselves in an equilibrium model on asymmetric information and insider trading in continuous time taking into account adverse selection and inventory cost. Lastly, we propose an approximate maximum likelihood estimator for the drift term of a  fractional Brownian motion with drift. 

Math-Fi seminar on 23 Nov.

2017.11.21 Tue up
  • Date: 23 Nov. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Masanori Koyama (Ritsumeikan university)
  • Title: TBA

Math-Fi seminar on 7 Nov.

2017.11.06 Mon up
  • Date: 7 Nov. (Tue.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Yong Hyun Shin (Seoul)
  • Title: Consumption and Portfolio Selection with Necessities and Luxuries

Math-Fi seminar on 2 Nov.

2017.10.31 Tue up
  • Date: 2 Nov.(Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • Time: 16:30-18:00
  • Speaker: Kanji Inui (Kyoto university)
  • Title: Discontinuity of energy density functions on Sierpinski gasket
  • Abstract: N-dimensional Sierpinski gasket is one of most important fractal. we consider energy density functions on it. Bell, Ho and Strichartz proved that this functions are discontinuous at every point if N = 2 [1]. I will talk about discontinuity of energy density functions on N-dimensional Sierpinski gasket.  
[1] R. Bell, C. W. Ho and R. S. Strichartz, Energy measures of harmonic functions on the Sierpiński gasket, Indiana Univ. Math. J. 63 (2014), 831–868
 

Math-Fi seminar on 12 Oct.

2017.10.03 Tue up
  • Date: 12 Oct. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room
  • TIme: 16:30-18:00
  • Speaker: Roland Friedrich (Saarland University)
  • Title: Operads and Stochastic Calculus

Math-Fi seminar on 5 Oct.

2017.10.03 Tue up
  • Date: 5 Oct. (Thu.)
  • Place: W.W. 6th-floor, Colloquium Room.
  • Time: 16:30-18:00
  • Speaker: Dai Taguchi (Osaka university)
  • Title: Semi-implicit Euler-Maruyama approximation for non-colliding particle systems

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