[Todos] Coloquios del Departamento de Física (jueves 19/4)

[pdmitruk en df.uba.ar]

Proximo coloquio, NOTAR CAMBIO DE AULA:

  COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA

http://coloquios.df.uba.ar/

  Charlas, café y galletitas

  En el Aula Seminario, 2do piso, Pabellón I, Ciudad Universitaria

  Jueves 19/4, 14hs:

  DYNAMICS OF COMPLEX SYSTEMS, CRITICALITY AND RECORD DYNAMICS

  HENRIK JELDTOFT JENSEN

  Imperial College London

  The paradigm of Self-Organised Criticality emphasises systems in a
stationary state created by the action of a slow external constant driving
rate. SOC postulates that the driven system self-organises to a critical
state. In the critical state the system is expected to exhibit abrupt
releases of energy in the form of macroscopic events termed avalanches. The
focus is on the probability distributions of the even sizes, which are
presumed to be scale free power laws in the limit of infinite system size.
Candidates for SOC are e.g. earthquakes, rain, forest fires and many
others. The scenario of Record Dynamics is concerned with non-stationary
and non-critical complex systems undergoing relaxation in order to release
a (generalised) internal strain induced at the moment of preparation. The
rate of activity decreases as one over time and the distribution of event
times follows a Poisson process in logarithmic time. The events sizes can
follow any distribution. Systems, which appear to follow the log-Poisson,
include spin-glasses, over damped relaxing particle models, models of long
time macroevolution and experiments on dynamics of ant colonies. 
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