Hydrodynamic Interactions and Internal Viscosity Effects

In the ARS-picture again we have to consider the q-dependence of C(q) (Eqs. 5.2 and 5.3). After Fourier transformation and considering again periodic bounding conditions, Eq. 5.17 yields characteristic relaxation rates  

They differ from (Eq. 5.7) by a mode-dependent friction coefficient. 

In the limit of C q)=C Eq. 5.20 may also be formulated in terms of the draining parameter. In this case for numerical purposes the sum in Eq. 5.20 

---