t Þ relative to the FIG. 9. Change of the Casimir momenta Δ p c; χ ð 0 Þ (from the local coarse-grained distribution) initial value p c; χ ð measured for the decay of a density fluctuation; varying χ values are indicated by colors in the legend. For reference, the 0 Þ → 2 1 = 3 − 1 from phase t Þ =p asymptotic limit of Δ p c; χ ð c; χ ð mixing is indicated by the dashed