Temporal Griffiths Phases

Abstract

Disorder is an unavoidable ingredient of real systems. Spatial disorder generates Griffiths phases (GPs) which, in analogy to critical points, are characterized by a slow relaxation of the order parameter and divergences of quantities such as the susceptibility. However, these singularities appear in an extended region of the parameter space and not just at a (critical) point, i.e. there is generic scale invariance. Here, we study the effects of temporal disorder, focusing on systems with absorbing states. We show that for dimensions $d\ge 2$ there are Temporal Griffiths phases (TGPs) characterized by generic power-law spatial scaling and generic divergences of the susceptibility. TGPs turn out to be a counterpart of GPs, but with space and time playing reversed roles. TGPs constitute a unifying concept, shedding light on the non-trivial effects of temporal disorder.

4 pages, 3 figures; Accepted in PRL

References in corpus (4)

• Rare region effects at classical, quantum, and non-equilibrium phase transitions
• Directed percolation criticality in turbulent liquid crystals
• Griffiths phases on complex networks
• Population extinction in a fluctuating environment

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