日時: 6月23日(木)
場所: 立命館大学 BKC ウエストウイング6階 談話会室
時間: 17:30 — 18:30
講演者: Mouez Dimassi 氏(ボルドー大学・立命館大学)
講演題目: Semiclassical Trace Formula for Systems of h-Pseudodifferential Operators and Application to the Spectral Shift Function
アブストラクト: In this talk we give a microlocal trace formula for a system of h-pseudodiifferential operators.
We apply this trace formula to the asymptotic of the counting function of the number of eigenvalues and to the asymptotics of the spectral shift function of the semiclassical Schrödinger operator with matrix valued potential.
Our proofs are based on a time independent method.
日時: 5月27日(金)
場所: 立命館大学 BKC フォレストハウス1階 F105
時間: 16:30 — 18:00
講演者: 尾張 圭太 氏(立命館大学), 多羅間 大輔 氏(立命館大学)
1. 16:30-17:10
講演者: 尾張 圭太 氏(立命館大学)
講演題目: On Convex Functions on Orlicz Spaces with $\Delta_2$-Conjugates
アブストラクト: We show that in an Orlicz space \(L^\Phi\) with the conjugate Young function \(\Psi\) being \(\Delta_2\) (so \(L^\Phi\) is the dual of \(L^\Psi\)), a proper convex function has a \(\langle L^\Phi,L^\Psi\rangle\)-dual representation iff it is order lower semicontinuous; more precisely, a convex set \(C\subset L^\Phi\) is \(\sigma(L^\Phi,L^\Psi)\)-closed iff for each order interval \([-\eta,\eta]=\{\xi:-\eta\leq \xi\leq \eta\}\) (\(0\leq \eta\in L^\Phi\)), the intersection \(C\cap [-\eta,\eta]\) is closed in \(L^0\). The result is based on the following technical lemma: for any norm bounded sequence \((\xi_n)_n\) in \(L^\Phi\) which converges in probability to \(0\), there exist forward convex combinations \(\zeta_n\in \mathrm{conv}(\xi_n,\xi_{n+1},…)\) as well as an element \(\eta\in L^\Phi_+\) such that \(\zeta_n\rightarrow 0\) and \(|\zeta_n|\leq \eta\). We show also that a finite-valued convex function on \(L^\Phi\) is \(\tau(L^\Phi,L^\Psi)\)-continuous iff it is sequentially \(\tau(L^\Phi,L^\Psi)\)-continuous on order intervals, and the condition is equivalent to the order continuity of the function.
This is a Joint work with Freddy Delbaen (ETH Zürich and Univ. Zürich).日時: 10月30日(金) 16:30 — 17:30
場所: 立命館大学 BKC フォレストハウス1階 F104
講演者: 原瀬 晋 氏(立命館大学)
講演題目: Implementing 64-bit maximally equidistributed Mersenne Twisters
アブストラクト: CPUs and operating systems are moving from 32 to 64 bits, and hence it is important to have good pseudorandom number generators designed to fully exploit these word lengths. However, existing 64-bit very long period generators based on linear recurrences modulo 2 are not completely optimized in terms of the equidistribution properties. In this talk, we develop 64-bit maximally equidistributed pseudorandom number generators that are optimal in this respect and have speeds equivalent to 64-bit Mersenne Twisters. This talk is based on a joint work with Takamitsu Kimoto at Recruit Holdings Co., Ltd.
日時: 7月14日(火) 16:30 — 17:30
場所: 立命館大学 BKC フォレストハウス1階 F111
講演者: Fabrice Baudoin 氏(パデュー大学)
講演題目: Hypocoercive diffusions
アブストラクト: In this talk, we will present a new method to study the convergence to equilibrium of hypocoercive diffusions. The method is based on local computations and parallels the Bakry-Emery approach to hypercontractivity.
講演者: Vania Sordoni(University of Bologna)
講演題目: Gevrey microhyperbolicity and FBI transform.
アブストラクト: We study the Gevrey singularities of the solution of microhyperbolic equations by using exponential weighted estimates in the phase space. In particular, we recover some known results on the propagation of Gevrey regularity in a elementary way, using microlocal exponential estimates