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Growth properties of the infinite-parent spatial Lambda-Fleming-Viot process

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Abstract

The infinite-parent spatial Lambda-Fleming Viot process, or infinite-parent SLFV, is a model for spatially expanding populations in which empty areas are filled with "ghost" individuals. The interest of this process lies in the fact that it is akin to a continuous-space version of the classical Eden growth model, while being associated to a dual process encoding ancestry and allowing one to study the evolution of the genetic diversity in such a population. In this article, we focus on the growth properties of the infinite-parent SLFV in two dimensions. To do so, we first define the quantity that we shall use to quantify the speed of growth of the area covered with the subpopulation of real individuals. Using the associated dual process and a comparison with a first-passage percolation problem, we show that the growth of the "occupied" region in the infinite-parent SLFV is linear in time. We use numerical simulations to approximate the growth speed, and conjecture that the actual speed is higher than the speed expected from simple first-moment calculations due to the characteristic front dynamics. We then study a toy model of two interacting growing piles of cubes in order to understand how the growth dynamics at the front edge can increase the global growth speed of the "occupied" region. We obtain an explicit formula for this speed of growth in our toy model, using the invariant distribution of a discretised version of the model. This study is of interest on its own right, and its implications are not restricted to the case of the infinite-parent SLFV.
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Dates and versions

hal-03661964 , version 1 (08-05-2022)

Identifiers

  • HAL Id : hal-03661964 , version 1

Cite

Apolline Louvet, Amandine Véber. Growth properties of the infinite-parent spatial Lambda-Fleming-Viot process. 2022. ⟨hal-03661964⟩
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