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- W2000382457 abstract "We study several fundamental properties of a class of stochastic processes called spatial Λ-coalescents. In these models, a number of particles perform independent random walks on some underlying graph G. In addition, particles on the same vertex merge randomly according to a given coalescing mechanism. A remarkable property of mean-field coalescent processes is that they may come down from infinity, meaning that, starting with an infinite number of particles, only a finite number remains after any positive amount of time, almost surely. We show here however that, in the spatial setting, on any infinite and bounded-degree graph, the total number of particles will always remain infinite at all times, almost surely. Moreover, if ({G,=,mathbb{Z}^d}), and the coalescing mechanism is Kingman’s coalescent, then starting with N particles at the origin, the total number of particles remaining is of order (log* N)d at any fixed positive time (where log* is the inverse tower function). At sufficiently large times the total number of particles is of order (log* N)d-2, when d > 2. We provide parallel results in the recurrent case d = 2. The spatial Beta-coalescents behave similarly, where log log N is replacing log* N." @default.
- W2000382457 created "2016-06-24" @default.
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- W2000382457 date "2010-11-24" @default.
- W2000382457 modified "2023-09-24" @default.
- W2000382457 title "Global divergence of spatial coalescents" @default.
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- W2000382457 doi "https://doi.org/10.1007/s00440-010-0332-5" @default.
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