On the asymptotic of exit problems for controlled Markov diffusion processes with random jumps and vanishing diffusion terms

TL;DR

This paper investigates the asymptotic behavior of controlled Markov diffusion processes with random jumps and vanishing diffusion terms, focusing on exit times, optimal controls, and related PDE limits.

Contribution

It introduces a two-step analysis combining eigenvalue minimization and large deviations to characterize exit distributions and PDE limits for such complex controlled processes.

Findings

Identifies optimal controls minimizing principal eigenvalues.

Characterizes exit location and distribution using large deviations.

Analyzes the PDE limits associated with vanishing diffusion.

Abstract

In this paper, we study the asymptotic of exit problem for controlled Markov diffusion processes with random jumps and vanishing diffusion terms, where the random jumps are introduced in order to modify the evolution of the controlled diffusions by switching from one mode of dynamics to another. That is, depending on the state-position and state-transition information, the dynamics of the controlled diffusions randomly switches between the different drift and diffusion terms. Here, we specifically investigate the asymptotic exit problem concerning such controlled Markov diffusion processes in two steps: (i) First, for each controlled diffusion model, we look for an admissible Markov control process that minimizes the principal eigenvalue for the corresponding infinitesimal generator with zero Dirichlet boundary conditions -- where such an admissible control process also forces the controlled diffusion process to remain in a given bounded open domain for a longer duration. (ii) Then, using large deviations theory, we determine the exit place and the type of distribution at the exit time for the controlled Markov diffusion processes coupled with random jumps and vanishing diffusion terms. Moreover, the asymptotic results at the exit time also allow us to determine the limiting behavior of the Dirichlet problem for the corresponding system of elliptic partial differential equations containing a small vanishing parameter.