Dynamical geometric modes in non-Euclidean plates.

A non-Euclidean elastic plate shaped as a saddle minimal surface shows a continuous stability degeneracy, with its softest geometric zero mode governed by damped-pendulum elastodynamics.

• Why it matters: Geometric zero modes can be excited by weak, generic inputs, but their dynamical behavior in non-Euclidean plates is poorly understood, especially how degeneracy evolves over time.
• What they did: The authors combine analytical theory with experiments on a saddle minimal surface plate, tracking how aging lifts the continuum of ground states while keeping the zero mode soft.
• The result: They model the soft-mode elastodynamics as a damped pendulum, where periodic driving reveals resonance (small oscillations and steady rotations) and high-frequency mixing with a flapping mode.

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