The conference is in English.
Abstract
The usual way to describe a fluid at equilibrium is to write, or try to write, its equation of state, which relates its pressure to its density and temperature. For a system out of equilibrium, as in the case of active matter, it can be shown that, in general, there is no equation of state. A surprising consequence of this is that for an active fluid, the pressure exerted by the fluid on a wall depends on the shape of the wall or the precise nature of the interactions of the fluid particles with the wall. The usual notion of pressure therefore loses its meaning for systems out of equilibrium.
