Analogy between equilibrium beach profiles and closed universes
arXiv:1909.02654 · doi:10.1103/PhysRevResearch.1.033002
Abstract
We reformulate the variational problem describing equilibrium beach profiles in the thermodynamic approach of Jenkins and Inman. A first integral of the resulting Euler-Lagrange equation coincides formally with the Friedmann equation ruling closed universes in relativistic cosmology, leading to a useful analogy. Using the machinery of Friedmann-Lema\^ıtre-Robertson-Walker cosmology, qualitative properties and analytic solutions of beach profiles, which are the subject of a controversy, are elucidated.
To appear in Phys. Rev. Research
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