Francesco Ginelli
University of Aberdeen, UK

The Boltzmann-Ginzburg-Landau approach for continuous descriptions of flocking active matter

I discuss a generic theoretical framework, denoted as the Boltzmann-Ginzburg-Landau approach, to derive continuous equations describing the large scale behaviour of flocking active matter. The Boltzmann-Ginzburg-Landau approach combines a low-density description in the form of a Boltzmann equation, with a Ginzburg-Landau-type expansion close to the instability threshold of the disordered state. I comment on the relationships and differences with other approaches -such as phenomenological hydrodynamics- and discuss applications to specific systems.