今後の予定 / Schedule(更新日:2026年06月15日)
日時/Date : 2026年06月20日(土曜) / 20 (Sat.), Jun. 2026
場所 : 関西大学 第4学舎 1号館 2階 数学科実験実習室
時間/Time: 15:00 -- 16:30
発表者/Speaker: 金 大弘(熊本大学)
題目/Title : Quasi-stationary and quasi-ergodic limits for Feynman-Kac semigroups via critical theory.
アブストラクト:We study quasi-stationary distributions (QSDs), Yaglom limits and quasi-ergodic limits for Feynman–Kac semigroups of symmetric Markov processes via the critical theory of Schrödinger forms. In contrast to much of the existing literature, our approach does not require intrinsic ultracontractivity, asymptotic intrinsic ultracontractivity, or related heat kernel estimates. Moreover, no finiteness assumption is imposed on the underlying measure. We establish the existence and explicit characterization of QSDs, Yaglom limits, and quasi-ergodic limits (including mean-ratio QSDs). These limiting objects are described in terms of the ground state of the associated Schrödinger form and the invariant probability measure of the corresponding Doob $h$-transform. Our approach combines criticality theory, ground state transforms, and ergodic properties of the transformed process, yielding a unified framework for the study of long-time conditioned behavior of Feynman–Kac semigroups on general state spaces.
これまでの講演 / Past Data
2026年度
日時/Date : 2026年05月16日(土曜) / 16 (Sat.), May. 2026
場所 : 関西大学 第4学舎 1号館 2階 数学科実験実習室
時間/Time: 15:00 -- 16:30
発表者/Speaker: 日野 正訓(京都大学)
題目/Title : Regularity properties of energy densities on the Sierpinski gasket
日時/Date : 2026年04月10日(金曜) / 10 (Fir.), Apr. 2026
場所 : 関西大学 第4学舎 1号館 2階 数学科実験実習室
時間/Time: 15:00 -- 16:30
発表者/Speaker: Piotr Graczyk (Université d'Angers)
題目/Title : Estimates of kernels of Dunkl and Dyson processes