Bouncing Balls on Tables Vibrating With Two Frequencies (or Table Tennis on a Shaking Table)

When a liquid droplet impacts a bath of the same liquid, it usually coalesces. However, if the bath is oscillated vertically with sufficient vigour (just below the “Faraday Threshold”), the droplet can bounce inde finitely on the surface [Couder et al., 2005]. These bounces generate gravity-capillary waves on the surface, which can influence the bouncing droplet’s motion. In some cases, the droplet “particle” “walks” on the bath’s surface guided by this “pilot” wave. Its interaction with other particles is mediated through the wave. This particle/wave allows macroscopic reproduction of certain quantum phenomena.

Julian Ceddia

La Trobe University

Julian Ceddia is a current student at La Trobe University who recently completed a Bachelor of Science, majoring in physics and mathematics. In 2015, Julian completed a degree in electronic engineering, also at La Trobe, and graduated with first-class honours. For the next three years, he worked as a software developer at Gentrack, before returning to university to study physics and mathematics. In 2020 he plans to complete an honours degree in physics, in the field of coherence in x-rays, with the aspiration to pursue a PhD in a related field thereafter. Julian is involved in several extracurricular research projects at La Trobe, including two synchrotron experiments with the physics department (phase reconstruction in XAFS & measurement of the complete coherence function of a synchrotron beam) and a high-altitude stabilised balloon with the engineering department.

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