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DY: Fachverband Dynamik und Statistische Physik

DY 41: Poster - Pattern/ Nonlinear Dyn./ Fluids/ Granular/ Critical Phen.

DY 41.8: Poster

Donnerstag, 3. April 2014, 17:00–19:00, P3

Aging in systems of classical oscillators — •Florin Ionita, Darka Labavić, and Hildegard Meyer-Ortmanns — School of Engineering and Science, Jacobs University Bremen, PO Box 750561, D-28725 Bremen, Germany

Aging is a familiar phenomenon from glassy systems, in particular from spin glasses and materials with slow relaxation processes after a perturbation, breaking of time-translation invariance, and dynamical scaling. We study these effects in systems of classical oscillators, active rotators and Kuramoto oscillators that are coupled with frustrated bonds. The induced multiplicity of attractors of fixed-point or limit cycle solutions leads to a rough potential landscape. When the system is exposed to additive noise, the oscillator phases migrate through this landscape and escape from one metastable state to another, generating a multitude of different escape times [1]. When the system is quenched from the regime of a unique fixed point towards the regime of multistable limit-cycle solutions, the autocorrelation functions depend on the waiting time after the quench and show dynamical scaling for an intermediate regime of time periods between the two measurements. We point out parallels between oscillatory systems and spin glasses in the physical origin of aging.
[1] F. Ionita, D. Labavić, M. Zaks, and H. Meyer-Ortmanns, Order-by-disorder in classical oscillator systems, Eur. Phys. J. B (2013), in press.