Large deviations for Markov processes with switching and homogenisation via Hamilton–Jacobi–Bellman equations

Serena Della Corte*, Richard C. Kraaij

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We consider the context of molecular motors modelled by a diffusion process driven by the gradient of a weakly periodic potential that depends on an internal degree of freedom. The switch of the internal state, that can freely be interpreted as a molecular switch, is modelled as a Markov jump process that depends on the location of the motor. Rescaling space and time, the limit of the trajectory of the diffusion process homogenises over the periodic potential as well as over the internal degree of freedom. Around the homogenised limit, we prove the large deviation principle of trajectories with a method developed by Feng and Kurtz based on the analysis of an associated Hamilton–Jacobi–Bellman equation with an Hamiltonian that here, as an innovative fact, depends on both position and momenta.

Original languageEnglish
Article number104301
Number of pages23
JournalStochastic Processes and their Applications
Volume170
DOIs
Publication statusPublished - 2024

Keywords

  • Large deviations
  • Switching Markov process
  • Hamilton–Jacobi equation
  • Viscosity solutions
  • Comparison principle

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