清华主页 EN
导航菜单

The derivative martingale in a branching Lévy process

来源: 05-17

时间:Wednesday, 14:00-15:00 May 17, 2023

地点:Ning Zhai W11

组织者:吴昊、杨帆、姜建平、顾陈琳

主讲人:Quan Shi 石权 AMSS, Chinese Academy of Sciences

Abstract

In the study of the branching Brownian motion, the convergence of the derivative martingale is of significant interest, since the limit can be used to study the travelling wave solutions of the FKPP (Fisher–Kolmogorov–Petrovskii–Piskunov) equation.

Recently, Bertoin introduces branching Lévy processes, generalizing the branching Brownian motion to a very general class of branching particle systems. For a branching Lévy process, we obtain a necessary and sufficient condition for the convergence of the derivative martingale to a non-trivial limit. This extends previously known results for branching Brownian motions and branching random walks.

Joint work with Bastien Mallein.


Speaker

石权,中国科学院数学与系统科学研究院副研究员。2016年毕业于瑞士苏黎世大学,研究方向为Lévy过程,分支粒子系统,增长分裂过程,随机树状结构。

返回顶部
相关文章
  • Limit sets for branching random walks on relatively hyperbolic groups

    AbstractBranching random walks (BRW) on groups consist of two independent processes on the Cayley graphs: branching and movement. Start with a particle on a favorite location of the graph. According to a given offspring distribution, the particles at the time n split into a random set of particles with mean $r \ge 1$, each of which then moves independently with a fixed step distribution to the ...

  • Geodesic Lévy Flight and the Foraging Hypothesis

    Abstract:The Lévy Flight Foraging Hypothesis is a widely accepted dogma which asserts that animals using search strategies allowing for long jumps, also known as Lévy flights, have an evolutionary advantage over those animals using a foraging strategy based on continuous random walks modelled by Brownian motion. However, recent discoveries suggest that this popular belief may not be true in so...