Exploring non-linear cosmological matter diffusion coefficients

الأصل · EN

Since microscopic velocity diffusion can be incorporated into general relativity in a consistent way, we study cosmological background solutions when the diffusion phenomena takes place in an expanding universe. Our focus here relies on the nature of the diffusion coefficient σ which measures the magnitude of such transport phenomena. We test dynamics where σ has a phenomenological dependence on the scale factor, the matter density, the dark energy and the expansion rate.