The beads in our polymer are assumed to be point particles. The second term
in Eq. (5.64) is proportional to the volume fraction of beads,
and therefore equals zero. The element *S*_{xy}(*t*) of the stress tensor then reads

(6.54) |

where c is the monomer concentration. The term yields

(6.55) |

So, we are left with

(6.56) |

We next introduce the normal mode expansion Eq. (6.24), and go through the usual analysis; finding

From now on we omit the subscript c at the averaging brackets, because it serves no purpose anymore.