no code implementations • 5 May 2022 • Tony Lelièvre, Geneviève Robin, Inass Sekkat, Gabriel Stoltz, Gabriel Victorino Cardoso
Molecular systems often remain trapped for long times around some local minimum of the potential energy function, before switching to another one -- a behavior known as metastability.
no code implementations • 22 Apr 2021 • Zineb Belkacemi, Paraskevi Gkeka, Tony Lelièvre, Gabriel Stoltz
In this context, approaches where the CVs are learned in an iterative way using adaptive biasing have been proposed: at each iteration, the learned CV is used to perform free energy adaptive biasing to generate new data and learn a new CV.
no code implementations • 28 Jan 2021 • Tony Lelièvre, Mouad Ramil, Julien Reygner
Consider the Langevin process, described by a vector (position, momentum) in $\mathbb{R}^{d}\times\mathbb{R}^d$.
Probability Spectral Theory
no code implementations • 15 Dec 2020 • Tony Lelièvre, Dorian Le Peutrec, Boris Nectoux
We consider the first exit point distribution from a bounded domain $\Omega$ of the stochastic process $(X_t)_{t\ge 0}$ solution to the overdamped Langevin dynamics $$d X_t = -\nabla f(X_t) d t + \sqrt{h} \ d B_t$$ starting from deterministic initial conditions in $\Omega$, under rather general assumptions on $f$ (for instance, $f$ may have several critical points in $\Omega$).
Analysis of PDEs Mathematical Physics Mathematical Physics Probability
2 code implementations • 6 Jul 2018 • Florent Hédin, Tony Lelièvre
Metastability is one of the major encountered obstacle when performing long molecular dynamics simulations, and many methods were developed to address this challenge.
Chemical Physics Computational Physics
no code implementations • 6 Jul 2018 • Tony Lelièvre, Mathias Rousset, Gabriel Stoltz
In order to avoid biases in the invariant probability measures sampled by discretizations of these stochastically perturbed Hamiltonian dynamics, a Metropolis rejection procedure can be considered.
Numerical Analysis Numerical Analysis 65P10, 65C40, 82-08