University of Cambridge > Talks.cam > DAMTP Statistical Physics and Soft Matter Seminar > Large deviations and optimal control forces for hard particles in one dimension

Large deviations and optimal control forces for hard particles in one dimension

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  • UserJakub Dolezal, DAMTP
  • ClockTuesday 30 April 2019, 13:00-14:00
  • HouseMR11, CMS.

If you have a question about this talk, please contact Etienne Fodor.

We analyse large deviations of the dynamical activity in one-dimensional systems of diffusing hard particles. Using an optimal-control representation of the large-deviation problem, we analyse effective interaction forces which can be added to the system, to aid sampling of biased ensembles of trajectories. We find several distinct regimes, as a function of the activity and the system size and analytically obtain approximate guiding forces for some of them. For high activity the system is hyperuniform and the interactions are long-ranged and repulsive. For low activity, there is a near-equilibrium regime described by macroscopic fluctuation theory, characterised by long-ranged attractive forces. There is also a far-from-equilibrium regime in which one of the interparticle gaps becomes macroscopic and the interactions depend strongly on the size of this gap. We discuss the extent to which transition path sampling of these ensembles is improved by adding suitable control forces.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

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