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Platonic bubble vibrations

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Underwater spherical bubbles are good acoustic resonators but are notoriously difficult to stabilize. Here, to circumvent these limitations bubbles are trapped within 3D-manufactured millimetric open frames having the shape of the five Platonic solids with identical faces (4 to 20 faces). We thus obtained « Platonic bubbles », stabilized during several days. We measured their acoustic vibration under driving, and we observe that their resonance frequency obeys a simple formula in spite of the shape complexity.