71 research outputs found
Crackling Noise
Crackling noise arises when a system responds to changing external conditions
through discrete, impulsive events spanning a broad range of sizes. A wide
variety of physical systems exhibiting crackling noise have been studied, from
earthquakes on faults to paper crumpling. Because these systems exhibit regular
behavior over many decades of sizes, their behavior is likely independent of
microscopic and macroscopic details, and progress can be made by the use of
very simple models. The fact that simple models and real systems can share the
same behavior on a wide range of scales is called universality. We illustrate
these ideas using results for our model of crackling noise in magnets,
explaining the use of the renormalization group and scaling collapses. This
field is still developing: we describe a number of continuing challenges
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