the sum of the critical contribution D_crit and the background contribution D_bg, according to [10]:

The symbols denote: η_bg, the background contribution to the viscosity; q_c, the crossover-correction wave number; the modified crossover wave number q̃_c as defined in the original equation; x = qξ; Ω_K(x), the Kawasaki function (see Eq. 3.66); and ξ = ξ₀ t^−0.63.

In the experimentally accessible range, the Kawasaki function is approximately unity (see Figure 5.14). The critical contribution therefore simplifies to:

Figure 5.14. Kawasaki function and the actual measurement temperatures.