EURO COIN DIFFUSION - a numerical study Tommi Bergman, Antti Lauri, Anna Ruhala and Walter Rydman Department of Physical Sciences University of Helsinki.

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Presentation transcript:

EURO COIN DIFFUSION - a numerical study Tommi Bergman, Antti Lauri, Anna Ruhala and Walter Rydman Department of Physical Sciences University of Helsinki Finland

P1 P2 P3 P4 P5 P6 THE METHOD Basic idea: coins move from one country to another with travellers. Residence time algorithm was used. –Also known as BKL (Bortz, Kalos, Lebowitz), kinetic Monte Carlo. Travel statistics from European Union data (Eurostat). Transitions selected randomly according to probabilities:

RESULTS Time evolution of the percentage of the Austrian coins in the domestic coin population. Effect of 5% annual replenishment.

RESULTS Time evolution of the percentage of the German, Italian and French coins in the Greek total coin population.

RESULTS: 50% FOREIGN

WHY? Diffusion is physics, isn’t it? It is very important to show common public that physics methods can be used in ”real life” applications. Out of curiosity.

SPECIAL THANKS Mikael Agopov for providing computer facilities. Summer hotel Hill for the electricity and coffee machine…