On multitype Branching Processes with Interaction

Maria Clara Fittipaldi; Sandra Palau

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arXiv · 2203.09701

On multitype Branching Processes with Interaction

Maria Clara Fittipaldi·Sandra Palau

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Abstract

Motivated by the stochastic Lotka-Volterra model, we introduce discrete-state interacting multitype branching processes. We show that they can be obtained as the sum of a multidimensional random walk with a Lamperti-type change proportional to the population size; and a multidimensional Poisson process with a time-change proportional to the pairwise interactions. We define the analogous continuous-state process as the unique strong solution of a multidimensional SDE. We prove that the scaling limits of the discrete-state process correspond to its continuous counterpart. In addition, we show that the continuous-state model can be constructed as a generalized Lamperti-type transformation of multidimensional L\'evy processes.

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Maria Clara Fittipaldi, Sandra Palau. 2022-03-18. On multitype Branching Processes with Interaction. https://arxiv.org/abs/2203.09701

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