Projects per year
Abstract
We study the problem of Brownian motion in a multiscale potential. The potential is assumed to have N+1scales (i.e. N small scales and one macroscale) and to depend periodically on all the small scales. We show that for nonseparable potentials, i.e. potentials in which the microscales and the macroscale are fully coupled, the homogenized equation is an overdamped Langevin equation with multiplicative noise driven by the free energy, for which the detailed balance condition still holds. This means, in particular, that homogenized dynamics is reversible and that the coarse-grained Fokker–Planck equation is still a Wasserstein gradient flow with respect to the coarse-grained free energy. The calculation of the effective diffusion tensor requires the solution of a system of N coupled Poisson equations.
Original language | English |
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Article number | 82 |
Number of pages | 34 |
Journal | Journal of Statistical Physics |
Volume | 190 |
Issue number | 4 |
DOIs | |
Publication status | Published - 31 Mar 2023 |
Keywords
- Brownian dynamics
- Multiscale analysis
- Reiterated homogenization
- Reversible diffusions
- Free energy
- 35B27
- 60H30
- Article
- 35Q82
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Dive into the research topics of 'Brownian Motion in an N-scale periodic Potential'. Together they form a unique fingerprint.Projects
- 2 Finished
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Rigorous coarse-graining of defects at positive temperature
Engineering & Physical Science Research Council
1/06/22 → 31/05/23
Project: Research Councils
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Variational structures, convergence to equilibrium and multiscale analysis for non-Markovian systems
Engineering & Physical Science Research Council
1/02/22 → 30/06/24
Project: Research Councils