Speaker
Mikko Alava
(Aalto)
Description
Systems exhibiting so-called crackling noise - intermittent
response to slow driving - most often surprise by the fact
that the crackling noise events are separated by waiting
times which follow fairly clean power-law distributions. As
the normal expectation would be instead Poissonian
statistics this indicates correlations and leaves us with
the question why. Here I present some results that explain
this by our inability to follow properly avalanches
experimentally (and in theory!): the waiting time behaviour
is due to detecting sub-avalanches that all belong to the
same correlated event. Experimental data from a slow
(in-plane) crack propagation experiment and studies of a
coarse-grained depinning model are presented to this effect.
