An in-depth study of the thermodynamics of nonequilibrium radiation is presented. The characterization of its nonequilibrium macroscopic state is performed in the framework of Informational Statistical Thermodynamics. This is done in terms of a nonequilibrium Dirac–Landau–Wigner single...

In nonequilibrium systems in the ballistic transport regime, every point of the system contains particles arriving from different regions–each of them at different temperatures–and there are only few collisions, in such a way that equilibrium between the different populations will be reached...

In the presence of strong external fields the Einstein relation between diffusion coefficient and friction coefficient must be modified, and it becomes dependent on the fields. We study how this transport relation should be generalized far from equilibrium for some particular forms of...