An acoustic standing wave acts as a lattice of evenly spaced potential energy
wells for sub-wavelength-scale objects. Trapped particles interact with each
other by exchanging waves that they scatter from the standing wave. Unless the
particles have identical scattering properties, their wave-mediated
interactions are nonreciprocal. Pairs of particles can use this nonreciprocity
to harvest energy from the wave to sustain steady-state oscillations despite
viscous drag and the absence of periodic driving. We show in theory and
experiment that a minimal system composed of two acoustically levitated
particles can access five distinct dynamical states, two of which are
emergently active steady states. Under some circumstances, these emergently
active steady states break spatiotemporal symmetry and therefore constitute a
classical time crystal.

Este artículo explora los viajes en el tiempo y sus implicaciones.

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