On the statistical physics of macroscopic interacting entities

Orateur : Eric BERTIN (Laboratoire de Physique, ENS Lyon)

Numerous systems of interest can be considered as composed of a large number of macroscopic interacting "entities", these entities being either real object s or more abstract mathematical modes. Examples range from physical systems like granular matter, foams, or turbulent flows, to complex systems outside physics like bird flocks or social systems. The dynamics of the involved macroscopic entities differs from that of standard microscopic particles, due for instance to energy dissipation in collisions between grains, or to selfishness in the decision process of social agents, thus questioning the possibility to apply standard statistical physics approaches to such systems. This issue is illustrated on several simple solvable models.

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