Dynamic universality class of Model C from the functional renormalization group

Understand

We establish new scaling properties for the universality class of Model C, which describes relaxational critical dynamics of a nonconserved order parameter coupled to a conserved scalar density.

• We find an anomalous diffusion phase, which satisfies weak dynamic scaling while the conserved density diffuses only asymptotically.
• The properties of the phase diagram for the dynamic critical behavior include a significantly extended weak scaling region, together with a strong and a decoupled scaling regime.
• These calculations are done directly in 2 < d < 4 space dimensions within the framework of the nonperturbative functional renormalization group.