Path-properties of the tree-valued Fleming-Viot process. (English) Zbl 1284.60166

Depperschmidt, Andrej; Greven, Andreas; Pfaffelhuber, Peter

Electron. J. Probab. 18, Paper No. 84, 47 p. (2013).

Summary: We consider the tree-valued Fleming-Viot process, \((X_t)t\geq 0\), with mutation and selection. This process models the stochastic evolution of the genealogies and (allelic) types under resampling, mutation and selection in the population currently alive in the limit of infinitely large populations. Genealogies and types are described by (isometry classes of) marked metric measure spaces. The long-time limit of the neutral tree-valued Fleming-Viot dynamics is an equilibrium given via the marked metric measure space associated with the Kingman coalescent. In the present paper, we pursue two closely linked goals. First, we show that two well-known properties of the Fleming-Viot genealogies at fixed time \(t\) arising from the properties of the dual, namely the Kingman coalescent, hold for the whole path. These properties are related to the geometry of the family tree close to its leaves. In particular, we consider the number and the size of subfamilies whose individuals are not further than \(\epsilon \) apart in the limit \(\epsilon \rightarrow 0\). Second, we answer two open questions about the sample paths of the tree-valued Fleming-Viot process. We show that for all \(t > 0\) almost surely the marked metric measure space \(X_t\) has no atoms and admits a mark function. The latter property means that all individuals in the tree-valued Fleming-Viot process can uniquely be assigned a type. All main results are proven for the neutral case and then carried over to selective cases via Girsanov’s formula giving absolute continuity.

MSC:

60K35	Interacting random processes; statistical mechanics type models; percolation theory
60J25	Continuous-time Markov processes on general state spaces
60J68	Superprocesses
92D10	Genetics and epigenetics

Keywords:

tree-valued Fleming-Viot process; path properties; selection; mutation; Kingman coalescent