Critical behavior of density-driven and shear-driven reversible-irreversible transitions in cyclically sheared vortices.
Sci Rep
; 11(1): 19280, 2021 Sep 29.
Article
em En
| MEDLINE
| ID: mdl-34588586
ABSTRACT
Random assemblies of particles subjected to cyclic shear undergo a reversible-irreversible transition (RIT) with increasing a shear amplitude d or particle density n, while the latter type of RIT has not been verified experimentally. Here, we measure the time-dependent velocity of cyclically sheared vortices and observe the critical behavior of RIT driven by vortex density B as well as d. At the critical point of each RIT, [Formula see text] and [Formula see text], the relaxation time [Formula see text] to reach the steady state shows a power-law divergence. The critical exponent for B-driven RIT is in agreement with that for d-driven RIT and both types of RIT fall into the same universality class as the absorbing transition in the two-dimensional directed-percolation universality class. As d is decreased to the average intervortex spacing in the reversible regime, [Formula see text] shows a significant drop, indicating a transition or crossover from a loop-reversible state with vortex-vortex collisions to a collisionless point-reversible state. In either regime, [Formula see text] exhibits a power-law divergence at the same [Formula see text] with nearly the same exponent.
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MEDLINE
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En
Ano de publicação:
2021
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Article