Airy distribution: Experiment, large deviations, and additional statistics

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Abstract

The Airy distribution (AD) describes the probability distribution of the area under a Brownian excursion. The AD is prominent in several areas of physics, mathematics, and computer science. Here we use a dilute colloidal system to directly measure the AD in experiment. We also show how two different techniques of theory of large deviations, the Donsker-Varadhan formalism and the optimal fluctuation method, manifest themselves in the AD. We advance the theory of the AD by calculating, at large and small areas, the position distribution of a Brownian excursion conditioned on a given area and measure its mean in the experiment. For large areas, we uncover two singularities in the large-deviation function, which can be interpreted as dynamical phase transitions of third order. For small areas the position distribution coincides with the Ferrari-Spohn distribution, and we identify the reason for this coincidence.

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Agranov, T., Zilber, P., Smith, N. R., Admon, T., Roichman, Y., & Meerson, B. (2020). Airy distribution: Experiment, large deviations, and additional statistics. Physical Review Research, 2(1). https://doi.org/10.1103/PhysRevResearch.2.013174

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