Supercritical super-Brownian motion with a general branching mechanism and travelling waves
Supercritical super-Brownian motion with a general branching mechanism and travelling waves
复制标题
具有一般分支机制和行波的超临界超布朗运动
DOI:
10.1214/11-aihp448
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发表时间:
2010-05
期刊:
影响因子:
--
通讯作者:
任艳霞
中科院分区:
文献类型:
--
作者:
A.E. Kyprianou;R.-L. Liu;A. Murillo-Salas;任艳霞
We oer a probabilistic treatment of the classical problem of existence, uniqueness and asymptotics of monotone solutions to the travelling wave equation associated to the parabolic semi-group equation of a super-Brownian motion with a general branching mechanism. Whilst we are strongly guided by the reasoning in Kyprianou [26] for branching Brownian motion, the current paper oers a number of new insights. Our analysis incorporates the role of Seneta-Heyde norming which, in the current setting, draws on classical work of Grey [20]. We give a pathwise explanation of Evans’ immortal particle picture (the spine decomposition) which uses the Dynkin-Kuznetsov N-measure as a key ingredient. Moreover, in the spirit of Neveu’s stopping lines we make repeated use of Dynkin’s exit measures. Additional complications arise from the general nature of the branching mechanism. As a consequence of the analysis we also oer an exact X(logX) 2 moment dichotomy for the almost sure convergence of the socalled derivative martingale at its critical parameter to a non-trivial limit. This diers to the case of branching Brownian motion, [26], and branching random walk, [2], where a moment ‘gap’ appears in the necessary and sucient conditions. Our probabilistic treatment allows us to replicate known existence, uniqueness and asymptotic results for the travelling wave equation, which is related to a super-Brownian motion.
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影响因子:
0.9
作者:
W. Kendall
通讯作者:
W. Kendall
影响因子:
1.4
作者:
Yuan-Chung Sheu
通讯作者:
Yuan-Chung Sheu
DOI:
10.1017/s0308210500029619
发表时间:
1993
期刊:
Proceedings of the Royal Society of Edinburgh: Section A Mathematics
影响因子:
--
作者:
S. Evans
通讯作者:
S. Evans
影响因子:
2.3
作者:
B. Chauvin
通讯作者:
B. Chauvin
影响因子:
1.9
作者:
R. Pinsky
通讯作者:
R. Pinsky