Sharp asymptotics of the first exit point density

Abstract : We consider the exit event from a metastable state for the overdamped Langevin dynamics $dX_t = -\nabla f(X_t) dt + \sqrt{h} \, dB_t$. Using tools from semiclassical analysis, we prove that, starting from the quasi stationary distribution within the state, the exit event can be modeled using a jump Markov process parametrized with the Eyring-Kramers formula, in the small temperature regime $h \to 0$. We provide in particular sharp asymptotic estimates on the exit distribution which demonstrate the importance of the prefactors in the Eyring-Kramers formula. Numerical experiments indicate that the geometric assumptions we need to perform our analysis are likely to be necessary. These results also hold starting from deterministic initial conditions within the well which are sufficiently small in energy. From a modelling viewpoint, this gives a rigorous justification of the transition state theory and the Eyring-Kramers formula, which are used to relate the overdamped Langevin dynamics (a continuous state space Markov dynamics) to kinetic Monte Carlo or Markov state models (discrete state space Markov dynamics). From a theoretical viewpoint, our analysis paves a new route to study the exit event from a metastable state for a stochastic process.
Type de document :
Pré-publication, Document de travail
146 pages. 2017
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https://hal.archives-ouvertes.fr/hal-01548737
Contributeur : Tony Lelievre <>
Soumis le : mercredi 28 juin 2017 - 07:04:16
Dernière modification le : mardi 19 septembre 2017 - 01:07:24

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  • HAL Id : hal-01548737, version 1
  • ARXIV : 1706.08728

Citation

Giacomo Di Gesù, Tony Lelièvre, Dorian Le Peutrec, Boris Nectoux. Sharp asymptotics of the first exit point density. 146 pages. 2017. <hal-01548737>

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