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Large fluctuations in a periodically driven dynamical system.

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>04/1998
<mark>Journal</mark>International Journal of Bifurcation and Chaos
Issue number4
Number of pages8
Pages (from-to)747-754
<mark>Original language</mark>English


Fluctuations in a periodically driven overdamped oscillator are studied theoretically and experimentally in the limit of low noise intensity by investigation of their prehistory. It is shown that, for small noise intensity, fluctuations to points in coordinate space that are remote from the stable states occur along paths that form narrow tubes. The tubes are centered on the optimal paths corresponding to trajectories of an auxiliary Hamiltonian system. The optimal paths themselves, and the tubes of paths around them, are visualized through measurements of the prehistory probability distribution for an electronic model. Some general features of fluctuations in nonequilibrium systems, such as singularities in the pattern of optimal paths, the corresponding nondifferentiability of the generalized nonequilibrium potential, and the feasibility of their experimental investigation, are discussed.