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<p>Recordamos el coloquio de hoy, NOTAR CAMBIO DE AULA:<br>
<br>
COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA<br>
<br>
<a href="http://coloquios.df.uba.ar/" target="_blank">http://coloquios.df.uba.ar/</a><br>
<br>
Charlas, café y galletitas<br>
<br>
En el Aula Seminario, 2do piso, Pabellón I, Ciudad Universitaria<br>
<br>
Jueves 19/4, 14hs:<br>
<br>
DYNAMICS OF COMPLEX SYSTEMS, CRITICALITY AND RECORD DYNAMICS<br>
<br>
HENRIK JELDTOFT JENSEN<br>
<br>
Imperial College London<br>
<br>
The paradigm of Self-Organised Criticality emphasises systems in a<br>
stationary state created by the action of a slow external constant driving<br>
rate. SOC postulates that the driven system self-organises to a critical<br>
state. In the critical state the system is expected to exhibit abrupt<br>
releases of energy in the form of macroscopic events termed avalanches. The<br>
focus is on the probability distributions of the even sizes, which are<br>
presumed to be scale free power laws in the limit of infinite system size.<br>
Candidates for SOC are e.g. earthquakes, rain, forest fires and many<br>
others. The scenario of Record Dynamics is concerned with non-stationary<br>
and non-critical complex systems undergoing relaxation in order to release<br>
a (generalised) internal strain induced at the moment of preparation. The<br>
rate of activity decreases as one over time and the distribution of event<br>
times follows a Poisson process in logarithmic time. The events sizes can<br>
follow any distribution. Systems, which appear to follow the log-Poisson,<br>
include spin-glasses, over damped relaxing particle models, models of long<br>
time macroevolution and experiments on dynamics of ant colonies. <br>
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