Elementary considerations on possible entropy-driven cosmological evolutions

For several independent reasons, the idea that notorious sources of entropy could exist in the Universe has been recently revived. By taking advantage of a new framework accounting for nonequilibrium processes in cosmology, we explicitly investigate the cosmological dynamics as a function of the entropy production, focusing on the stability of the system. An exhaustive investigation is performed. As the main physical conclusion, we show that for a wide class of entropy source terms, the fluid dynamics converges toward an effective cosmological constant. Constraints on the associated entropic force are also obtained.