Discovery of propagating trains of oscillons over Faraday waves in a 1D experiment

¹ Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física Ciudad Universitaria, 1428 Buenos Aires, Argentina
² Laboratoire de Physique et Mécanique des Milieux Hétérogėnes, UMR CNRS 7636, ESPCI-Paris, Université PSL, Sorbonne Université, Université Paris Cité - 75005 Paris, France
³ CONICET - Universidad de Buenos Aires, Instituto de Física Interdisciplinaria y Aplicada (INFINA) Ciudad Universitaria, 1428 Buenos Aires, Argentina
⁴ Institut Franco-Argentin de Dynamique des Fluides pour l'Environnement (IFADyFE), CNRS (IRL 2027), Universidad de Buenos Aires, CONICET - 1428 Buenos Aires, Argentina

Received: 20 December 2024
Accepted: 28 April 2025

Abstract

We report the discovery of highly localized structures traveling over a one-dimensional pattern of Faraday waves in a vertically vibrated fluid layer confined in a thin annular cell. These propagating structures emerge spontaneously beyond a threshold and coexist with the underlying pattern. They move at constant speed, in trains of sharp peaks that co- and counter-propagate along the cell, with velocities largely exceeding the Faraday waves drift. Our results raise the question whether propagating localized structures are also observable in other parametrically driven systems in physics.