Negative diffusion in the Functional Renormalization Group flow for the Quark-Diquark Model
This paper identifies negative diffusion as the intrinsic cause of numerical instabilities in the Functional Renormalization Group flow of the Quark-Diquark Model at low temperatures and high chemical potentials, and proposes a hyperdiffusion-based regularization scheme to stabilize the flow for reliable studies of color superconductivity and inhomogeneous phases.