Abstract
This paper presents a Lie-Trotter splitting for inertial Langevin equations (geometric Langevin algorithm) and analyzes its long-time statistical properties. The splitting is defined as a composition of a variational integrator with an Ornstein-Uhlenbeck flow. Assuming that the exact solution and the splitting are geometrically ergodic, the paper proves the discrete invariant measure of the splitting approximates the invariant measure of inertial Langevin equations to within the accuracy of the variational integrator in representing the Hamiltonian. In particular, if the variational integrator admits no energy error, then the method samples the invariant measure of inertial Langevin equations without error. Numerical validation is provided using explicit variational integrators with first-, second-, and fourth-order accuracy.
| Original language | American English |
|---|---|
| Pages (from-to) | 278-297 |
| Number of pages | 20 |
| Journal | SIAM Journal on Numerical Analysis |
| Volume | 48 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2010 |
| Externally published | Yes |
ASJC Scopus subject areas
- Numerical Analysis
- Computational Mathematics
- Applied Mathematics
Keywords
- Boltzmann-Gibbs measure
- Geometric ergodicty
- Langevin equations
- Lie-Trotter splitting
- Ornstein-Uhlenbeck equations
- Variational integrators