Eddi et al. (2009b) examined the interaction of a walker with barriers overlaid by a thin fluid layer. The incidence of the pilot-wave field on the barrier generates partial reflection and an evanescent tail that decays across the barrier. The reflected wave typically causes the reflection of an approaching walker; however, the drop-wave-barrier interaction occasionallypermits the droplet to tunnel across. The tunneling probability decreases exponentially with thebarrier width and increases as the Faraday threshold is approached. Once again, the quantum-likebehavior (Gamow 1928) results from the pilot-wave dynamics, and the unpredictability is rootedin the complex interaction between the droplet and its spatially extended guiding wave.
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