Resolution dependence of most probable pathways with state-dependent diffusivity
arxiv(2024)
摘要
Recent experiments have probed the relative likelihoods of trajectories in
stochastic systems by observing survival probabilities within a tube of radius
R in spacetime. We measure such probabilities here for a colloidal particle
in a corrugated channel, corresponding to a bistable potential with
state-dependent diffusivity. In contrast to previous findings for
state-independent noise, we find that the most probable pathway changes
qualitatively as the tube radius R is altered. We explain this by computing
the survival probabilities predicted by overdamped Langevin dynamics. At high
enough resolution (small enough R), survival probabilities depend solely on
diffusivity variations, independent of deterministic forces; finite R
corrections yield a generalization of the Onsager-Machlup action. As corollary,
ratios of survival probabilities are singular as R → 0, but become regular,
and described by the classical Onsager-Machlup action, only in the special case
of state-independent noise.
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