Dynamics of an infinite age-structured particle system

The Markov evolution is studied of an infinite age-structured population of migrants arriving in and departing from a continuous habitat $X \subseteq\mathds{R}^d$ -- at random and independently of each other. Each population member is characterized by its age $a\geq 0$ (time of presence in the population) and location $x\in X$. The population states are probability measures on the space of the corresponding marked configurations. The result of the paper is constructing the evolution $μ_0 \to μ_t$ of such states by solving a standard Fokker-Planck equation for this models. We also found a stationary state $μ$ existing if the emigration rate is separated away from zero. It is then shown that $μ_t$ weakly converges to $μ$ as $t\to +\infty$.

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