= Zimm model
{c}
A dilute-solution bead-spring model including solvent-mediated <hydrodynamic interactions>. In its scaling regime, a chain of size $R$ has translational <diffusion coefficient> of order $k_BT/(\eta_sR)$ and longest relaxation time of order $\eta_sR^3/(k_BT)$. Intermediate-time segment mean-square displacements scale as $t^{2/3}$. Screening of hydrodynamic interactions in a concentrated solution changes the regime toward <Rouse model> behaviour; constraints from <polymer entanglement> require additional physics.
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