River cross-sectional profiles satisfy the Friedmann equation for an Anti-de Sitter universe; the associated action extremizes friction and dissipation, and the extremum is a maximum by second variation analysis.
Visco-elastic cos- mology for a sparkling universe?,
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Laboratory rivers extremize friction and are cosmological analogues
River cross-sectional profiles satisfy the Friedmann equation for an Anti-de Sitter universe; the associated action extremizes friction and dissipation, and the extremum is a maximum by second variation analysis.